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.
Georgia sheriff's dept. zeros in on case of Kendrick Johnson, 17, and whereabouts of school wrestling team when he was last seen alive
Judge calls trial, execution of black teen George Stinney, Jr. for beating deaths of two white girls a "truly unfortunate episode in our history"