By now the facts are well-known: Trayvon Martin was a 17-year-old young black man who, on Feb. 26, 2012, was walking home from a 7-Eleven in Sanford, Florida, with a bag of Skittles and a bottle of iced tea. George Zimmerman, a neighborhood watchman of white and Latino heritage, though advised by police not to pursue Trayvon himself, got out of his car carrying his 9-millimeter handgun. Allegedly after some confrontation, Zimmerman shot Trayvon dead.