Update 4:20 P.M.
D.C. police say a Holocaust Museum guard, Stephen Tyrone Johns, and the alleged shooter, James von Brunn, were rushed to George Washington University Hospital.
Police have now confirmed that Johns has died.
As Florida looks to expand its "Stand Your Ground" law, mothers speak out, one calling effort to include warning shots in law "heinous"
Two 16-year-olds have been charged with first-degree murder in the death of schoolmate Ivan Mejia, 17, whose body was found Saturday night in Garland, Texas