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.
New details emerge after a stunning arrest in the 2005 disappearance of Georgia teacher and beauty queen Tara Grinstead
Authorities in Kansas on Friday declined to discuss a motive in the crime, which stoked fears about the treatment of immigrants in the U.S.