Bobby Butler, 55, was shot and killed on November 22, 2010, in Chicago after intervening during an attempted purse snatching. Butler was walking home from the Central Park L station in Lawndale when he saw an armed robber accost a young woman. He shouted at the assailant and crossed the street toward him; the robber shot Butler in the chest. He was taken to Mount Sinai Hospital and died during surgery.

Those who knew Butler said he had been trying to turn his life around—becoming drug-free, attending church, and starting a new job—before the fatal encounter. Witnesses reported he was lying in the street after the shot and said he couldn’t feel his legs. How can anyone with information about that night help bring more clarity to what happened?