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.
Police say Richard Hoagland married and fathered a child under the assumed identity -- allegations came to light after Ancestry.com search
Another deadly attack occured in Europe Friday as Norwegians marked the anniversary of a massacre that left 77 dead