Three months ago, photographer Tim Hetherington was killed by Gaddafi’s forces in Libya. These are his final images. Nine days after Tim Hetherington was killed, I received an email from him. It was sent on April 20, the day he died, but for whatever reason, spent a week in digital purgatory. I read it at 2 a.m. on a Friday morning, still feeling numb and confused by his death. “Hey man, just checking in,” he wrote. “Crazy day today. Full on city fight. It’s an incredible story . . . and hardly anyone here.” In some strange way I felt that Tim was still...