I can't stop thinking about that day. In the flames, a terrible secret. It shook that community to the core, especially when those horrific details started to come out about what happened inside that house. What did happen behind these gates? Was there anything in the Savopouloses' life that suggested they had enemies? We go inside the dramatic investigation... Boom! They get a hit. We've got a name. We've got a face. ...and the nationwide manhunt for the suspected killer. Police have identified the suspect accused of killing four people, and they think he is in our area. Kia ora, I'm Sonya Wilson. Tonight on 20/20 ` the bizarre quadruple murder inside a multimillion-dollar mansion in Washington DC and the police investigation unfolding right now. A wealthy family with no known enemies held hostage for just $40,000 in cash. The parents and their 10-year-old son killed along with their maid. Why? BELL TOLLS It wasn't supposed to be like this. Two teenage sisters mourning their murdered parents and little brother. Their multimillion-dollar home boarded up. DRILL WHIRRS An abrupt ending to a love story that seemed destined to play out as happily ever after. A love story that starts in high school. Amy Martin and Savvas Savopoulos meet at Springbrook High School in Silver Spring, Maryland, just north of Washington DC. They both decide to attend the University of Maryland, where a popular and outgoing Savvas spends the next four years pursuing the beautiful but shy Amy. He a fifth-generation Washingtonian, the son of a metalworks company CEO; she a self-described army brat whose family moved often. What were they like together? They love each other. Their housekeeper of two decades, Nelly Gutierrez, says the Savopouloses were the picture-perfect couple. In my 19 years, 20 years working for the family, they never fight. They were so good together. He really love Amy very very deep. And the same way, you know` she was the same way. They would have three children. Abigail, now 19, Katerina, 16, and Philip, 10. Savvas, known for a strong work ethic and gentle manner, succeeds his father as CEO of American Iron Works, supplying metal not to your local five-and-dime but projects like these. Settling in as a young, wealthy Washington couple, they buy this gabled, red-brick home in 2001, with its own library and music room, surrounded by manicured lawns, hedges and gates. So this is one of the most established neighbourhoods in Washington. We're talking not only are you a stone's throw from the Vice President's house, but this is sort of a billionaires' enclave. You'll have titans of industry, billionaires, senators, congressmen, ambassadors. And as part of the DC elite, the Savopouloses have money, a private jet and a 44-ft yacht. 10-year-old Philip, known as Flip, also had a somewhat atypical and expensive hobby ` go-kart racing, traveling around the country, competing in his own kart, with his own sponsor. And it's at one of those go-kart tracks that Savvas Savopoulos meets this man ` I feel good. I feel good. fellow racing enthusiast 28-year-old Jordan Wallace. Their friendship would lead to a job as Savvas' personal assistant, and Wallace would end up playing a pivotal role in those final hours before that quadruple murder. Was it an armed robbery gone wrong or a calculated murder-for-hire? It begins with a terrifying home invasion. Also inside the mansion, the family's housekeeper Vera Figueroa. She had been with the Savopouloses since her friend, and the family's other housekeeper, Nellie Gutierrez, got her the job. You helped her work with the Savopoulos family, right? Yes, and I took her over there. And it was, like, almost five years ago. Long-time crime reporter Jennifer Donelan has been covering the story for ABC affiliate WJLA. This started out as a story about a fire, right? Right. We're trying to figure out did something more sinister happen before the fire? That evening, one of the captives, Savvas Savopoulos, leaves a voicemail telling Gutierrez not to come in the next day. But Gutierrez doesn't get the message until the next day. When I got that message on Thursday, I was thinking, and I start calling them. So I call her, and I say, 'Hi, Vera. What's going on?' No answer. But at about 9pm, the strangest call by far. A call for a food delivery. We can confirm that we made a delivery to the house. Police say it's Amy Savopoulos calling Domino's Pizza. She orders two pies, gives a credit card number and special instructions. 'Don't ring the doorbell. I'm caring for a sick child. Just leave it on the front door.' The Domino's driver says the porch light is on, but the house is dark. As instructed, the driver leaves the pizza, rings the bell and drives away, taking with him an opportunity to end the ordeal for the terrified people just inside. There were things that happened that, of course, now we can look back on and say 'what if?' Unbelievably, somebody in that house in these dark and brutal hours has an appetite, gobbling up most of the pepperoni pie, leaving a crust or two. That night, Savvas Savopoulos calls his assistant, Jordan Wallace, the man the family met at that go-kart track, making arrangements for a package to be delivered to the mansion the next morning. He says he got a call from Savvas Savopoulos to bring $40,000 cash to the house. Police say that Wallace responded by text ` The longest night passes on Woodland Dr. As Thursday dawns, the next phase of the plan becomes apparent. Jordan Wallace meets another employee at a bank near Savopoulos' company, American Iron Works. He gets four neat stacks of $100 bills, 40 grand, calls his boss for further instructions. Savvas Savopoulos tells his assistant to bring the cash to his house, come into the garage, the car's unlocked. Not to give it to him, but to put it in a car, which you would think would set off alarm bells. And then you wonder why didn't that person call police? Wallace heads to the Savopoulos home and drops the cash on the driver's seat of a red sports car. But for some reason, that doesn't stop the crime. Police say the killing begins. We were getting source information that there was blunt force trauma to the bodies, that there were stab wounds to the bodies, that the bodies also had been tied up. The family's terrifying final moments alive pieced together from police documents and ABC News sources. The three adults ` Savvas and Amy Savopoulos and Vera Figueroa ` are held in an upstairs bedroom. The women are restrained. Savvas is not. The little boy, Philip, separated from the grown-ups in another bedroom. The fact that the three adults were in one room, you have to wonder how much the suspects were using that son as a point to extort them. Once 10-year-old Philip's room is set on fire, the killers flee. Before the fire can spread to where the adults are, the fire department gets the alarm. It's 1.30pm on Thursday. The story blows up. The case that is shaking a neighbourhood to its core tonight. The media descends on the neighbourhood. Crime Scene Investigators have been here all day long. Early that afternoon, someone notices Amy Savopoulos' blue Porsche is missing from the house. Police ask the public for help, but it wasn't hard to find ` just follow the smoke. The Porsche torched in a church parking lot in Maryland. Now, what came with that, which was critical, was surveillance video. They were able to capture video of a man exiting out of that car and leaving the scene. Notice enhanced video shows a man carrying a white bucket. Jot that down. Back at the burned mansion, authorities are already sifting through the grisly scene, The whole reason why you set something on fire in a case like that is to get rid of evidence. But getting rid of the evidence is not as easy as it seems. They're going to comb through that house and try and find whatever evidence they can to close this case and to capture everyone involved. When we come back ` a microscopic clue in the strangest place, and the daring late-night manhunt and takedown. US Marshals tell us they're forced to do something they've never tried before. And then he said, 'Move, go, go, go.' Stay with us. Welcome back. Well, those behind the grisly murders of four people in a Washington DC mansion set the house on fire to cover their tracks, but firefighters are on the scene just in time to save a crucial piece of evidence from the flames. It'll lead investigators straight to the prime suspect and spark a massive manhunt. This is where that strange delivery ` the Domino's pizza ` and those discarded pieces of crust comes home to bite the mansion home invader. A slice of pizza crust broke this case wide open. Crime scene specialists recover the leftover crusts. Nothing more than household garbage to you and me, but for them, the perfect serving of prime evidence. The crime scene detectives go inside that house. They see two boxes of pizza, slices of crust still inside the box. They rush the crust to the ATF lab, working around the clock. Looking at food, when someone takes a bite of it, we can see if there's any DNA present. Todd Bill, an ATF analyst, lifted the DNA profile off that pizza crust. If there's something, like in this situation, where there's a violent offender, we can call the FBI, and they will do a immediate search for that profile. Tuesday May 19th, only five days after the fire and the murders, a breakthrough. Boom. They get a hit. We've got a name. We've got a face. Daron Wint, 34 years old. Big muscles, and a rap sheet as long as his dreadlocks. His DNA was on file because of that lengthy criminal record. And now we knew at least one person who was allegedly inside that house. Now all they have to do is find him. Thus begins an intense, 48-hour, nationwide manhunt. From what I understand, the cars were right over here. Robert Fernandez with the US Marshals Service is part of the task force now hunting for Wint. They do this massive trail. It is an unbelievable investigation, with the best in the business. Then Wednesday night, exactly one week after the family had been taken captive in their mansion, authorities get a line on Wint. We were able to determine that he had fled the DC area. Allegedly loaded with thousands in cash, they say he chooses to travel by bus 200 miles north to Brooklyn, New York. And that's his girlfriend's apartment, right? That's his girlfriend's apartment. They deploy. Police have identified the suspect accused of killing four people, and they think he is in our area. But they're too late. He saw himself on the news, from what we understand, and then fled the area. And you just missed catching him? That's right. Wint hires a livery cab, and amazingly, heads right back to the epicentre of the manhunt ` Washington DC. We are distributing his photograph as widely as possible. As the dragnet tightens, everyone worrying about one thing ` the danger. There was major concern that Daron Wint had nothing to lose. Were people going to get hurt? Thursday night, a week after the murders and fire at the Savopoulos home, US Marshals track the group to a Howard Johnson's in the DC suburb of College Park, Maryland. You're going in ready for anything. That's right. And immediately, a surprise. The US Marshals' advance team notices Wint leaving the hotel, but he isn't alone. That advance team radioed to us where they had a suspicion that he was in one of two vehicles that were right over here. In one of those vehicles, Wint and three women, in the other, two more men. At that moment, both of those vehicles left and turned northbound. Didn't see that coming? Not at all. But we're ready to roll with it. Authorities tail the group, now traveling in a two-vehicle caravan ` a box truck with North Carolina tags, followed by a white Chevy Cruze. How many cars are following him at this point? Altogether, it could have been 25, maybe 30 vehicles. At one point, the truck and car make a sudden U-turn, but apparently still do not know they're being followed by a small army of police. Moments later, authorities spring the trap, employing a daring manoeuvre to stop the cars cold. It's called a vehicle pin blocking manoeuvre. The Marshals' cars surround the white Chevy and the box truck on all sides, and on the commander's go, the front car reverses, the rear car speeds forward and four more cars surround the target vehicles on all sides. Basically, pinning the car at four points and immobilising it. It's a tactic the Marshals have never tried with a vehicle as large as a box truck. So you had to do something you had never done before? That's right. That's why I wanted the helicopter. Air support is called in from Prince George's County PD, and the Marshal in command on the ground waits for the perfect moment. We finally got to the red light, and he said, 'Move, go, go, go.' I went around and blocked off the truck. I could see the drivers of the truck and the passenger just stop. They were looking in their mirrors. They saw all the lights, and they put their hands up. Immediately? Immediately. I think they were completely and totally startled and surprised. So this is where it happened? Yeah, right here. In the rear passenger seat of the white Chevy, Daron Wint, trapped. He followed commands. He got out. He crawled. He got on the ground. He was immediately handcuffed and brought over to a police vehicle, and he didn't say a word. People were coming out of their homes. You could hear people asking to each other as they stood on their porches, 'Is it him? Is it him?' The fact that this went down without incident, as they say, was a huge relief for everyone involved. In the car Wint was driving in, police report finding clothing, an iPad, two knives, cash and thousands of dollars in money orders. And in the box truck, even more cash. What did you see? Well, in the truck I saw, in the side compartment of the passenger door, a big wad of cash. And it was $100 bills. You could tell it was hundreds. Police say one of the people stopped with Wint converted at least $10,000 into those money orders. It was the end of a painstaking 48-hour manhunt. No sleep. The nation has, quite frankly, watched this search go from DC to New York, now back here to the DC area, um, and now he is in custody. Wint appears in superior court the next day, charged with first-degree murder while armed. What was interesting to me, the capture, instead of almost answering questions, led to even more questions. Why? People kept saying, 'There's no way he did this by himself.' After the break ` who else was involved in the brutal quadruple murder? 20/20 grapples with the unanswered questions. Though Mr Wint is now incarcerated, our work is not done. I was in the FBI for 30 years. I've worked a lot of home invasions. It just doesn't make any sense that one guy could control four people for almost around the clock. INTRIGUING MUSIC WOMAN: We also are learning new information. Authorities believe more than one person may have been involved. That's the big mystery ` who else was involved? Still unknown almost one month since that horrific night on Woodland Dr. Though Mr Wint is now incarcerated, our work is not done. I was in the FBI for 30 years. I've worked a lot of home invasions. It just doesn't make any sense that one guy can control four people for almost around the clock ` confine them, constrain them, brutalize them, and then set them on fire. Investigators are continuing the hunt for those accomplices, but where to look? Did Savvas have enemies? No. Not that you saw? No. Nelly Gutierrez also worked as a Savopoulos family housekeeper, says she's known the family for 20 years. Very good family. They were so nice. Very good. Happy about life. With the potential for violent accomplices still at large, there are several unanswered questions that we know of tonight. Number one ` motive. I'm not totally convinced that it was just about money. You have a guy that's a millionaire, lives in a beautiful 5-plus million-dollar house, you're gonna ask for 40 grand? I mean, none of that works for me. Another question ` why did Jordan Wallace change details of his story? Remember Wallace, who posted these videos on his enthusiasm for go-kart racing? Savopoulos met Wallace working at the go-kart track, where he coached 10-year-old Philip in racing. Now hired as assistant and driver to Savopoulos, he was tasked with delivering the 40,000 in cash to the house that horrible day. Yet when questioned about his role in dropping off the cash, police say he changed his account. And the big question is why? Why are there these inconsistencies in his story? First, the timing. He tells investigators Savopoulos' instructions to bring the money came on Thursday ` the day of the murders. But then police read a text on his phone and see that contact actually happened the night before. Then after detectives confront him with a text message and show that no, that's not the way it happened, and he says, 'Yes, you're right.' And he tells a different story. Wallace also said at first he was given the money in the Manila envelope, yet later changes that to a red bag. And finally, he claims to have found the keys and unlocked the Savopoulos car, where he had been told to leave the cash, yet later admitted it was unlocked when he arrived. Wallace has a clean record ` we found just one traffic ticket to his name ` and seemed to love his job, posting this photo on Instagram from inside Amy Savopoulos' Porsche. Breaking news overnight ` the suspect in that brutal murder at a Washington DC mansion arrested. Five others arrested with him. Our next open question ` who were the others arrested with Daron Wint, and why were they quickly let go? Why, at the very least, you didn't charge them with aiding and abetting a fugitive? Because they obviously were with him. Because the idea that they don't know anything about what happened in that mansion is just pure fantasy. Police find a large stack of hundreds in the truck, cash and money orders in the Chevy, and one occupant admits to buying at least $10,000 in money orders. At this point, we only know the name of one of Daron Wint's five companions that day, his brother Darrell Wint. It's still unclear to me how those people got released within a few hours. It does give you the potential mechanism then to track them. Who do they talk to? Who do they call? Who do they visit? All of the things that may lead you either to further corroboration they had some involvement or to somebody else in the crime. Finally, is the burning Savopoulos Porsche a clue that there are other suspects? It had been driven from the murder scene and found about 15 miles away. At one point, someone was seen driving this Porsche that had short, close-cropped hair, but Wint has long hair, long dreadlocks. What does that tell you? It's always sounded like, to me, that somebody else drove that Porsche to that location, uh, and that that's another player. And remember that man caught on surveillance video fleeing the burning car? That white bucket we pointed our earlier could be another important clue. We noticed that it's similar to these buckets found by police searching the home of Daron Wint's parents, the very place he'd been living at the time of the murders. Also found in the burnt Porsche, a lime green construction vest, perhaps like this, that matches several more found in the garage of the charred house. Maybe they used that as a ruse to get in the house. I mean, if they knocked on the door and the housekeeper answered and they said, you know, 'We're from the gas company, and we think you have a gas leak,' she's probably going to let you in. I asked housekeeper Nelly Gutierrez if those vests could have belonged to the Savopoulos family. Did you ever see anything like that when you were there? No. Meanwhile, moving trucks appeared at the Savopoulos house this week, clearing out the belongings of lives cut tragically short. And the surviving daughters, Abigail and Katerina, returned, perhaps a final time, to what was once their home. What do you say to the Savopouloses' teen daughters? That I love them. Nellie Gutierrez, who helped get her fellow housekeeper, Vera, hired, now misses her and the rest of the family every day. It's very hard. And sometimes people, they don't realise that` how hard it is when you care for... a person like Amy or this family, Vera, my friend. And I` I learned a big lesson, so many lessons through this ` that life... is very short, because today's today, and tomorrow, you never know what's going to happen. Daron Wint is still the only person charged over the murders. He's yet to face trial, but his lawyer says he was set up. Next week ` the wolf pack, trapped by their parents, the six brothers who grew up locked in a New York apartment, and how they managed to break free.