TIM HETHERINGTON, a British-American photographer, was killed on April 20, 2011, along with American photographer Chris Hondros while they were covering the conflict in Libya. Hetherington was forty. He had previously photographed the human side of conflicts in Liberia, Sierra Leone, Nigeria, and Afghanistan. Regarding his war photographs, Hetherington told the New York Times in 2007, “I wanted to be part of the solution, not part of the problem.” His work is collected in several books and in Restrepo, the acclaimed 2010 documentary he codirected about an American platoon fighting in Afghanistan. (The photo above is from Hetherington’s collection on the civil war in Liberia.)