On April 20, 2011, shortly after the release of his documentary Restrepo - and only six weeks after attending the Oscar ceremony as a nominee - photographer and filmmaker Tim Hetherington was killed by mortar fire in the city of Misrata, Libya, where he'd been covering the civil war. He bled out in the back of a pick-up truck while being raced to the hospital, and a brilliant life was cut tragically short. Throughout his ten-year career, Hetherington dedicated himself to dramatic frontline stories such as Liberia and Afghanistan, and also transcended the conventional boundaries of image-making to become one of the most important journalists of his generation. Filmmaker and friend Sebastian Junger traces Tim Hetherington's work across the world's battlefields.