Activists from the Black Lives Matter movement are calling on Florida authorities to charge three officers involved in the fatal shooting of a man walking home with an unloaded air rifle he'd just purchased. As NBC News reported in May, questions about the shooting were raised by a photograph that showed the man, Jermaine McBean, lying dead on the ground with white earbuds — contradicting police who said he did not have anything in his ears when they shouted at him to drop the rifle. In addition, a witness to the 2013 shooting, tracked down by a lawyer for McBean's...