Was there anyway that that struggle could've ended without you and your dad killing Jason? Yeah, there was another way ` we could've died. Was it self-defence or was it murder? 12 blows with a child's baseball bat. And then the verdict that no one saw coming. Lots of fathers hate their sons-in-law. Well, a lot of those fathers don't end up with a dead son-in-law and a bloody baseball bat in their hands. Now they're telling their versions ` only to 20/20. He's gonna hit my dad with the bat, and that's it. He's gonna kill my father. A life-and-death struggle ` because of a father's love for his daughter or hatred of her husband? He's got her in a chokehold. And if I don't stop this, I'm gonna die trying. Instead it was the other way around. And this morning both are charged with murdering her husband. They're alleging that you and your father hit Jason once he was already on the ground, that you essentially finished him off. Tonight ` a marriage at the breaking point. Her fears ` It was suggested that Jason may have killed his first wife. I knew that. What? You know, you think, 'Oh, maybe that's gonna happen to me.' Her secret recordings of her husband's temper. And her fight for the children she was afraid of losing. You know, I begged. I begged, begged, 'Please don't take the kids.' Now we're taking you up the stairs to the moment of truth ` or is it? I do not believe that I committed a crime. I believe that I did the right thing. Copyright Able 2017 Kia ora. I'm Carolyn Robinson. Welcome to 20/20. Tonight ` a difficult and rare story. A former FBI agent convicted or murder. Tom Martens and his daughter Molly were both found guilty of the murder of her husband. Now, only to 20/20, they are both telling what they say led to that night of terror, when Jason Corbett was killed. Reporter Linzie Janis has been covering this story for a year and a half and was in the North Carolina courtroom when the verdict came down. Hi, Molly. Hi. Tonight in a 20/20 exclusive ` you'll hear from the only people who really know what happened inside this Winston-Salem bedroom. Or more precisely, the only two still alive to talk about it. It's horrible. A man died. But a man also attacked my daughter. And a man tried to protect his daughter. Molly Martens-Corbett and her father, Tom Martens, sat down with us pre-trial to tell us their version of events. What do you hope to get across today? The truth. Molly and Tom make for a rare pair of murder defendants. She'd never broken the law, while he'd made a career enforcing it working for the FBI for 30-plus years. And yet here they are enmeshed in an international murder mystery, a 'whydunit', that's made news from the mountains of North Carolina... The closing arguments actually happened... ...to the Emerald Isle. Jason Corbett, originally from Limerick, was found dead at his home... Tonight's tale begins in Tennessee, where Molly Martens grew up. While Knoxville feels like home today, it's a place Molly once ran from, after struggles during college. I was planning on being a doctor. But really for the first time in my life, school was hard. You know, I never really had to study before, so that was a challenge. There were other challenges ` migraines, bouts with depression and general anxiety about her future. Molly kept it all inside. I thought, maybe, I would just go somewhere, you know, and figure myself out for a while. She signs up with a nanny agency and soon receives an inquiry from a man in desperate need. Jason Corbett, who sent me messages requesting that I contact him regarding his children. It was emotional. He had lost his wife, and there were two babies. At age 24, the once aspiring doctor throws caution to the wind and takes the job offered by the Irish widower. I arrive in Ireland, and it's beautiful. So, Jason's family say that you guys hit it off very quickly, that you guys actually got together and slept together that first night? That's not true, but it was very quick. I was apprehensive and concerned that it was too quick, but I didn't want to call up my parents and say I was uncomfortable with this and I'm coming home. I failed again. The unusual relationship toggles between personal and professional, but in short order, Molly finds her place in the world. She is needed. She is wanted. She is accepted as a mother figure. It was wonderful. For me, it gave me a sense of responsibility, and it filled a void I had that made me feel like I was worth something. You became a mother overnight. Yes. Were you in love with Jason? I was. Jason Corbett has many loves ` his beer, his favourite soccer team and most of all he loves his kids, little Jack and Sarah. After three years together, the modern family buys plane tickets to the United States. One-way tickets. He loved the United States. He thought that the opportunities for children were significantly better. In 2011, Irish eyes are smiling and wedding bells are ringing. Tom Martens gets to walk his daughter down the aisle. The wedding day, I was excited for them, and it was a delightful experience and a beautiful wedding. The kids were in the wedding? They were, of course. Mm-hm. They were flower girl and ring bearer. The happy family soon moves to Davidson county in North Carolina and a home that's tobacco country's answer to Ireland's stone castles ` four beds, three baths and 5500ft2 for the kids to run around in. There's even enough space for the in-laws to stay overnight. It really was a dream summer. Jason was working really hard, but it was a golf-course community, and he was really excited about golfing on his day off. From what I saw, they were a loving couple. I didn't see anything that would question the relationship. the king of the cul-de-sac. He was very cordial, and he was loved by everyone over here. Loved by everyone? Mm-hm. The gentle Irish giant. He was good. Meanwhile, the kids, now 6 and 4, are thriving. Jack Corbett swings a mean bat on the little league team. Young Sarah is the social butterfly, always impeccably dressed. They made friends immediately. It was like a wonderland. Molly's got it all, except one thing ` Jason is refusing to make her the children's legal mother. At that time, I felt like he was actually gonna follow through with the adoption papers, and that, you know, I would feel more confident about securing my rights to the children. It never happened. Instead, Molly says, Jason was growing addicted to the narcotic of domination. He was very controlling, and he was very possessive. The first few months, you just kinda brush that off. You think, 'Oh, well, he just loves me so much,' but those kinda things got worse. He was uncomfortable with you socialising? He was paranoid that I would develop some feelings for someone else or that someone would look at me the wrong way. He was worried you were gonna leave him for another man. He was worried about a lot of things. You know, he'd come home from buying new golf club for $500, and he'd open the fridge, and there would be a case of raspberries, and that would be it. 'We can't afford raspberries.' And he would throw the raspberries on the floor. According to Molly, it's a side of Jason no one sees, because to friends, he's the life of the party. The husky 260-pound Irishman always has a smile on his face at neighbourhood gatherings. But in private ` He would dictate what she should wear or what she should shop for or when she should be home or when she should or shouldn't leave or text her repeatedly or engage in just various forms of, you know, controlling behaviour. He would demand to see her phone, look at her computer history. That sort of thing. Molly says the fights were escalating, and she says the kids witnessed them. This is son Jack's recollection when he was later evaluated by a social worker. Did the physical abuse become more frequent or more extreme? Everything became more frequent and more extreme, except for the apologies. They became less frequent. And less extreme. If you're thinking Molly should pack a bag and run, she says she considered it. She visited a lawyer who told her to document any abuse, which she did, making surreptitious audio recordings. ...with the family. Are you finished dinner, hon? I'm talking to you! No. Is this how you treat`? You just ignore me. I said, 'I'd like to have dinner`' Jason. I'm talking to you! I shouldn't have to say it over and over. I shouldn't have to say Molly` Can you guys get out the stuff for` See, you're doing it again. I'm talking to you, and you're still talking about something else. GIRL: Stop fighting. Stop fighting. (SCREAMS) Molly is apparently caught between a rock and a hard place. Without a legal adoption, she has no shot of custody in the event of a divorce. She says the stakes are too high to simply walk away. So you suffered because you didn't want to lose the children? I never would've left the children. No. I couldn't imagine. Sometimes I thought maybe I'm being selfish, maybe their life would be better, you know, if they don't have to deal with this, but ultimately I always came to the same conclusion that, you know, it wouldn't. It wouldn't be better for them to lose a second mother. Tom Martens knows his daughter is suffering, but decides she doesn't need another man bossing her around. I wasn't going to interfere in Molly's marriage. That was Molly's marriage. A marriage, she says, that only gets worse when the lights go out. Sometimes he would be angry, and choking me would turn into something sexual. Or sometimes the other way around. So sometimes he would choke you in anger and sometimes he would choke you during sex? Did that scare you? Everything always felt so real and so scary in the moment when it was happening. Did you ever pass out? I did, and it did always make me think of Mags, his first wife, and wonder if that's what happened to her. Mags Fitzpatrick, who suffered from asthma, died in the middle of the night. The official cause ` a heart attack. But Tom Martens remembers a startling conversation he says he once had with the dead woman's father. His name was Mikey Fitzpatrick. And I just thought I was making polite chitchat, polite conversation, and I said, 'You know, what do you think of old Jason?' And his response was, 'I think he killed my daughter.' And I go... 'Whoa.' You know, I'm not really expecting that kind of thing. From Ireland, the Fitzpatrick family later denied the conversation ever happened, but Molly had heard the same allegation. At some point it was suggested that Jason may have killed his first wife, that perhaps it wasn't an accident. Yes, so definitely was, and prior to that, I mean, I... I knew that. What? You know, the first time and second time and the third time and the 20th time that you are suffocated or strangled or someone holds their hand over your mouth or a pillow over your face and you can't breathe for an extended period of time, you know, you think, 'Oh, well, you know, his first wife died at 3 o'clock in the morning 'and maybe that's gonna happen to me.' Coming up ` something very bad is about to happen. He's already gone this far, and he's gonna kill us. And we'll have the details of that deadly night when 20/20 returns after this break. . Welcome back to 20/20. Tonight, we are looking at the controversial conviction of a father and daughter for the murder of her husband. In an exclusive interview with 20/20, Molly Martens-Corbett and her father, ex-FBI agent Tom Martens, give their side of the story of that deadly night when her Irish husband, Jason Corbett, was beaten to death with a baseball bat. Here's reporter Linzie Janis. In the early hours of August 2nd 2015, Tom Martens, the straight-laced 31-year veteran of the FBI, makes a shocking call to 911. His 39-year-old son-in-law Jason Corbett is dead on the bedroom floor, bludgeoned by a baseball bat by Tom. It's a gruesome end to a day that began so differently. It was a Saturday. The kids both had playdates. Sarah had one earlier in the afternoon, and Jack had a birthday party that evening. Molly's parents, Tom and Sharon, were never supposed to be with their daughter that day, but when their own plans fall through, they make a fateful decision to drive over and visit for the night. Were they welcome in your home? I know they didn't always feel comfortable in my home, but they knew it was beneficial. The Martens arrive around 8.30 that evening bearing a special gift for the family little leaguer, grandson Jack. I had brought over a baseball bat. For Jack. He thought it was really cool to get any form of baseball gear that was a hand-me-down. After some pizza for dinner, everyone settles in for the night, with Tom and his wife in a guestroom in the basement, Molly and Jason in their room on the first floor and the kids upstairs. Around 3am, Molly says she is awakened by a sound familiar to any parents. Sarah woke up. She'd had a nightmare, and she came down, and the kids were not supposed to come in the room, you know, and wake up Jason, so they would just kinda stand outside of the door and whisper until I heard them. She says she gets 8-year-old Sarah back to bed before tiptoeing down to her room, trying not to wake Jason. But he woke up, and he was angry, and he wanted to know why I had gotten up, and I told him it was because Sarah had had a nightmare, and then he was just furious, because Sarah had been doing this lately and, you know, she just wanted to be coddled, and she was too old for that, and I shouldn't have gotten out of bed. Molly says knowing her parents in the house gave her more courage to stand up for herself. I said, 'She's just 8. She had a nightmare. 'I should be allowed to go upstairs and comfort our daughter.' You know, all she wanted was her mom to lay with her for a couple of minutes. And he forgot my parents were there. I don't know what precisely woke me up, but I heard were loud voices and a thumping. Something bad was going on, so I grabbed that little league baseball bat, and I ran upstairs. He wanted to shut me up, so he covered my mouth, and then he started choking me, but at some point when he stopped, I screamed. The next thing I remember is my dad standing in the doorway. What did you see? It's awful. He has his hands around her neck, and he quickly moves to move her in front of him, between me, and so he's got her in a chokehold. Fear was, you know, secondary at that point. I was just so ashamed that my father would see me like that. Allowing myself to be treated like that. Did you know that your dad had a bat with him? I don't know if that registered right away, but it did register. And I said, 'Let her go.' And he said, 'I'm gonna kill her.' Then he starts to edge toward the master bathroom, which has a door. And my thought was if I he gets that door between me and him, then she's dead and there's nothing I can do about it. And so I reached around and I hit him in the back of the head with the baseball bat. And what happened when you hit him? If he could've gotten angrier, he did. Tom says the blow to the back of the head didn't stop Jason. He kept dragging Molly towards the bathroom. He makes it to the bathroom, but I'm too close. He can't close the door, and I'm the bathroom with him, and I hit him again. I mean, I have room now, and I hit him hard in the back of the head again. You hit him hard? Yep, I did. He's still got her by the throat, but he changes tactics. He decides to come back at me, and I'm swinging the bat. And he catches the bat in his hand, and he sends me flying across the room. Jason just grabbed the bat away. It was like it was nothing. He could choke me with one hand and grab the bat with the other, and he was just so much stronger, and I was screaming, 'Don't hurt my dad! Don't hurt my dad!' And I thought he was gonna hit my dad with the bat, and that's it. He's gonna kill my father. So, I get up, and I rush him. And I grab the bat with two hands, and I hang on for dear life. And I'm trying to hit him with the bat, hit him with my elbow, and hit him with my fist or anything else, but I'm gonna hang on to that bat, and he goes down. He went down? He went down. And then I realised, 'OK, he's not gonna get up. OK, looks like the threat is over.' This version of events will eventually be challenged, but what he know is that around 3am, Tom Martens makes this call to 911. The 911 dispatcher instructs Tom to begin CPR on Jason. Tom hands the phone over to his daughter. And the whole time I'm thinking that he's gonna sit up and start choking me again, and it was terrifying. Did the kids sleep through that struggle and the 911 call? The kids did. I keep their rooms closed and my door closed, because arguing was a common theme. And your mom was downstairs the whole time? My mom was in the guest bedroom beneath us. I guess my dad told my mom to stay in the room with the dogs. EMS and police arrive. They took Molly and her father to separate patrol cars and bring them in for questioning. I was told, you know, 'Don't worry. It looks like self-defence.' Molly and her father are photographed and told they are free to go. Deputies drive them back to the house about seven hours after the incident. The sheriff was there. He came up to me, and I said, 'How much longer are you guys gonna be here?' 'We're done.' They were finished processing the scene? Yes. That quickly. They were done. But investigators are just getting started, and to them what looked like self-defence soon looks a lot more like murder. They're alleging that you essentially finished him off. Did you murder Jason? There's more to the story of what happened that night, and it's about to cost Molly her reputation, her freedom and even worse the children who've called her mommy for the last eight years. Yeah, I begged. I begged, 'Please don't take the kids.' We'll have those emotional details when we return from this break. Stay with us. . Welcome back, as 20/20 continues with The Last Ones Standing. Father and daughter Tom and Molly Martens have been questioned and released by police over the death of Molly's husband. Tom Martens has admitted killing his son-in-law, bashing him with a baseball bat, but he says it was self-defence. However, as police begin investigating, they find evidence that makes them believe that it was murder. Here's reported Linzie Janis. In the aftermath of Jason Corbett's death,... The 39-year-old father of two was found dead in his home earlier this month. ...there is a bitter divide, as wide as the Atlantic. Two families in two countries with two very different notions of the man he was. In the medieval city of Limerick, Ireland, hundreds of mourners eulogise a loving husband and father. Jason's casket is adorned with the word 'daddy'. But stateside, his widow, Molly ` adamant that he abused her for years ` is desperate to secure custody of 10-year-old Jack and 8-year-old Sarah. You think that they're gonna see the truth and everyone is going to recognise that... that you're the mother to these children. This is Jack in an interview with a social worker. But Jason's will, written before his marriage to Molly, states that both children are to be placed in the custody of his sister, Tracey, in the event of his death. And Tracey flies to North Carolina determined to execute that wish. Molly says she is stunned when after a guardianship hearing a woman from social services arrives with an order to take the children Molly has raised for eight years. I begged. I begged. Begged for her to think about our lives and think about what she was doing and... 'Please don't take the kids.' So, they were crying and, you know, screaming, 'Don't take me from my mommy. Don't take me from my mommy.' And I took them out to the van, and I buckled them in. I told them that I loved them and I'd see them soon. They drove off, and I melted. I just melted into the driveway. The next day, Molly is granted one hour of visitation with the children. There are tearful hugs. I love you so much. She gives Sarah her necklace as a memento, and she struggles to keep her composure. They said if I cried or the kids got upset, that I would be removed. So I did a good job of holding it together for them, and we looked at pictures. That's you. That's you. That's baby Sarah when we went to go see Santa. She says she was later sent a letter they wrote. It said that... And, yeah, I never saw them again. They were taken... the next day to Ireland. She posts messages like these on Facebook, including her phone number and email, in the hope they can contact her. And she makes a plea on an Irish radio show. In return, she receives this voicemail from Jack. While Molly's focused on her fight for the children, what she doesn't know is that police are focused on her and her father. They no longer see her as a suffering widow. Now she becomes a suspect. What happened to make this go from justified to self-defence to murder? The investigation itself. Davidson County prosecutors say they took a hard look at these photos and noticed a vast difference between Jason's injuries and the absence of injuries, they say, on Molly and her father. How brutally was Jason beaten? It was horrific. Would you have expected to see more injuries on Tom and Molly had they been in the kind of struggle that they described? They walked away with nary a mark on them, and he left on a board with his skull crushed and his scalp ripped off. What can I say? The struggle occurred. I've described it as accurately as I can, and that's what happened. The investigators believe the evidence never lies and that this bloody brick or paving stone found in the bedroom tells a convincing story ` the story of a wife in a murderous rage. In her police interview, Molly admits she hit her husband with it. I hit him on the head. You hit him on the head with what? With a brick on the nightstand. Why would there be a paving stone in your bedroom? The kids and I were going to decorate a number of paving stones. Anyway, it was left on my nightstand. But in our interview, her lawyers advised her not to discuss what she did with it. Did you take action and hit Jason yourself at that point with the paving stone? It's just not something that I'm prepared to talk about right now. Prosecutors are convinced that brick shattered both Jason's skull and Molly's self-defence claim. When she was crushing his skull with that brick, she had anger to assuage and resentment to address. And she addressed those on his head. What you are saying is that Tom and Molly beat Jason after he was already down. Yes. When he was no longer a threat. Yes. The physical evidence suggested that he was still being struck in the head after he went down. Eventually, prosecutors conclude the G-man and his daughter have cooked their whole story, and they charge Molly and Tom with second-degree murder and voluntary manslaughter. Molly Martens and her father Thomas had surrendered themselves. And this morning, both are charged with murdering her husband. For Jason's family in Ireland, who had bombarded the DA's office with letters demanded justice for Jason, it is welcome news. We want to express our appreciation to Davidson County and to the investigators for their hard work and determination to uncover the truth. It's a huge story in Ireland. A 32-year-old woman and her father... ...have been charged in connection with the death... ...of Irishman Jason Corbett. And the Irish tabloids immediately have a field day, dubbing Jason a gentle giant and Molly as the merry widow, painting her as a gold digger with mental problems. But Tom Martens, ironically an expert himself in processing crime scenes from his days at the FBI, says the investigation was flawed. He says he was stunned that after their police interviews he and Molly had no further contact with the Sherriff's office. What I thought would happen next was that they would want follow-up interviews. Pretty logical, you know? We were ready for them to call us any time to be questioned again about any memories that may have resurfaced when you're not in a state of shock. It's not worthy of a second interview and I'm being charged with second-degree murder? How do you feel going into trial? Are you feeling confident? I'm feeling worried. But I feel righteous. I would not want to live with not having taken action. Are you guilty of murder? No. Is your father guilty of murder? No. My father is, you know, guilty of... saving my life. So, what is the real story ` murder or self-defence? We'll have more when 20/20 returns. (POIGNANT MUSIC) This is the very moment... Audrey understood that more than 20,000 Kiwis were paying the actual wholesale price of their power, but she was still paying whatever fixed price her power company felt like. . Welcome back to 20/20 and tonight's story about father and daughter Tom and Molly Martens, who are charged with the killing of Molly's husband Jason. The former-FBI agent and his daughter claim self-defence, but the North Carolina prosecutors say it was murder, that they planned to kill him. As Linzie Janis continues her story ` the trial begins. Now to new developments in that father-daughter murder trial so many are following. Tom Martens and his daughter Molly walked into a North Carolina courtroom facing charges of second-degree murder. Tom Martens took the stand and told jurors he simply did what any father would do. You were defending your daughter? I was. I'm going to do everything that I have to do to save her life. And did you think that he would kill you? Yeah. I mean, once it starts... It's what it is. It's a fight. You either fight and lose, or you fight and win. But prosecutor Alan Martin immediately started chopping at his story like the trunk of a Carolina pine. There was so much that didn't make sense. The... the physical activity that he described between he and Jason would flip from being him completely overpowered to seconds later powerfully overpowering that same man. Prosecutor Greg Brown honed in one the one person notably absent from Tom's account ` his wife, Sharon. Where was she during that violent struggle? I asked him a number of questions about the noise that was taking place ` when the baseball bat was hitting the walls, when he indicated that he was thrown to the floor ` and then no wife came running up the stairs to check on him, no wife called 911. It was just incredulous. Put yourself in his shoes for a moment. He's a father. He walks in and says he sees his daughter being strangled by his son-in-law. You're telling me you wouldn't try to intervene? I'm telling you I don't believe that's what happened. Prosecutors tell the jury to disregard Tom's testimony and focus instead on the physical evidence that they say proves their overkill theory ` evidence like that brick and the blood spatter in the bedroom. What does the blood spatter tell us? Tom Martens was very clear. He said, 'When Jason went down, the threat was over.' And in this particular case, the blood spatter information that was testified showed that Jason was down and still being bludgeoned. They point to pictures like these, noting that most of the blood spatter is on the lower half of the wall, with the area above relatively clean. Prosecutors say that demonstrates that Jason was still being hit after he was down. Did that happen? No, that didn't happen. The last hit, he was still standing up, and hopefully, you know, I'd like to think that there's science to prove that, because the truth is the truth. The prosecution believes the truth that Molly and her father killed Jason with malice. To prove that, they turn to a witness from Tom's past. You had one witness on the stand who used to work with Tom Martens, who said, 'Yeah, we had a few conversations, and he said he didn't like his son-in-law.' He actually said, 'That son-in-law, I hate him.' But lots of fathers hate their sons-in-law. How do you get murder from that? A lot of those fathers don't end up with a dead son-in-law and a bloody baseball bat in their hands. Did you murder your son-in-law? No, I didn't murder my son-in-law, and... I would challenge any reasonable man, much less a reasonable father, to say that this was unnecessary force. I used the force that was necessary to end the threat. But at trial, prosecutors challenged the notion that there ever was a threat that night, going so far as to float a possible motive for murder ` that Jason may have been considering returning to Ireland and taking the two most precious people in Molly's life with him. Molly's life was about those children, and she wanted those kids. She was willing to kill for it? Apparently, maybe so. And defence attorney Walter Holton says Molly's story of being attacked could easily have been corroborated if investigators had done a better job. Everything that pointed to Molly being the victim of strangulation, which she was, they ignored. They didn't check Jason's hand, and lo and behold, there it is. This crime scene photo shows a blonde hair that investigators never tested. Holton says Molly was a victim of abuse that night and for years before it and two people in the house knew it ` Jack and Sarah. Mr Corbett's family took the children to Ireland. They could've brought them back and let them testify. That was not gonna happen in a million years, and the judge knew that. But that might not have helped Molly. According to the prosecutors, before trial they spoke to Jack, and this time he denied Jason had ever abused her. Wasn't there anybody else that could testify? The only way we could do that was to force Molly to testify. Molly has a constitutional right not to take the stand. Why not put Molly on the stand? Why? What burden of proof do we have? It's not up to us to prove innocence. And something else jurors never heard ` I shouldn't have to say, 'Molly`' Can you guys get out the stuff for band practice. See, there you go again. I'm talking to you, and you're... Those audio recordings Molly says demonstrate Jason's abuse. In their closing argument, prosecutors made it clear that for them this case was about more than proof beyond a reasonable doubt. It was personal. I am very passionate about this case. I very much believe that those two people killed a man... made orphans of two children who did not have to lose their father. That argument was for Jack and for Sarah. Coming up ` the verdict that shook the courtroom, and the jurors are speaking out. There was no doubt in my mind. We'll have that verdict and the stunning aftermath when 20/20 continues. . Welcome back as 20/20 continues. The jury is set to return its verdict in the trial of Tom and Molly Martens. The father and daughter are charged with murder over the death of Molly's husband Jason. As we continue, reporter Linzie Janis speaks with both defence and prosecution lawyers as well as members of the jury. After less than four hours of deliberation, the jury in the Martens case returns a resounding verdict ` guilty of second-degree murder. The judge sentences both father and daughter to 20 to 25 years in prison. They are led from the courthouse in shackles. And this morning, a father and daughter in North Carolina are headed to prison. What an emotional day this has been. The shockwave from the guilty verdict is still reverberating on two continents. The wife and father-in-law of Limerick man Jason Corbett have been found guilty of second-degree murder. The verdict today was a relief. Jason's family feels his reputation has been redeemed. This was a good man. Jason was a loving man, and he was a great father. My niece and nephew were made orphans in a brutal merciless killing. The prosecution is satisfied. There was justice for Jason today. While the defence is not only beaten but bewildered. This was the worst possible outcome for your clients. What happened? I mean, the jury ruled against us. I've been involved in many cases where in a criminal justice system, where the initial ruling didn't go my clients way, and that's why we continue to go on and fight. We think they got it wrong, and we think they missed quite a bit. Just how did the jurors decide to convict? Three of them kindly sat down with us to explain. Based off the evidence that was presented, there was no doubt in my mind that I made the right choice. That evidence, specifically the blood spatter testimony and the crime scene photos, sold them on the prosecution's overkill theory. Once you hit a certain point and you do not stop, it's no longer self-defence. Those images of Jason Corbett's skull were so graphic, Nancy, you actually threw up? Yes, ma'am. I don't think there's anything or any experience in life that could prepare you to look at those pictures. But the lack of injuries on Molly and Tom led them even further into a theory the prosecution never even presented. I have a theory for myself. I believe Molly made the first blow. Why? I believe Jason was in bed sleeping, and she struck him with the paver. And her dad helped her cover it up? I think at some point, Dad came to help out and help cover up. There was blood on the pillow and on the comforter. That may have been the first blow. And then it progressed from that point, where he got out of bed and tried to protect himself. I believe that's when Tom had to intervene because of the size difference of Molly and Jason. To me, the choking did not occur. As for motive? They say perhaps money, perhaps the kids, perhaps just years of pent up rage. But in any case, after the deed was done, they believe Molly and Tom took some time to conspire before they called 911. And what was happening during that passage of time? Setting up the scenario. 'What do we tell so we're on the same page and get our story straight?' Tom's saying, 'Maybe because I'm FBI, they'll help look the other way to a degree.' I believe not once in his mind, did he think, 'Oh, Davidson County, Podunk town,' would even question his 40 years of FBI experience. I feel like he thought that he could outwit Davidson County. And Davidson County outwit the Martens. Molly tells us that Jason was a habitual abuser ` emotional and physical abuse. She says she has suffered for years. Where's the evidence? The defence did not once suggest any of that. That's not our fault. That's the lawyer's fault. I mean, your defence should have defended you. We had to go by what we heard. The jury has rendered judgment. But what about the Corbett kids? What do they think of Molly now? Before the judge sentenced Molly and Tom Martens, the prosecution read an impact statement from young Jack Corbett, which said, in part, Molly Martens is so many bad things. Once thing she is not is part of my family. Molly Martens will not be forgotten. She will be remembered as a murderer. Do you believe that he wrote every word of that letter? This was a handwritten letter complete with the scratch outs and the misspellings for a 12-year-old. I believe from the bottom of my heart he wrote every word after careful thought. When we interviewed Molly in May, she was a free woman, able to enjoy simple pleasures like a jog through the woods. Tonight she is behind bars, but she told us it makes little difference. As far as she's concerned, her life is already over. Do you have any dreams? Do you want to rebuild your life one day? You can't ever get your life back when something like that happens. My life ended that day that they took the kids. And if anyone can relate to the pains of parenting, it's her own father. It's horrible. A man died. But a man also attacked my daughter. And a man tried to protect his daughter. We all try to do the right thing, and I tried to do the right thing, and I'd rather live with what I did than live with what I didn't in that circumstance. Tom Martens and Molly Martens-Corbett were both sentenced to 20 to 25 years in prison. However, in a twist, their lawyers have filed a motion to have those sentences thrown out because of juror misconduct, in part because of what the jurors said in their interviews with 20/20. Well, that's our show for tonight. Thanks so much for joining us. Kia ora. Nga mihi.