The Associated Press is reporting that the Holocaust Memorial Museum guard shot today by a gunman has died at George Washington University Hospital.

He has been identified as Stephen Tyrone Johns, and had worked at the museum for six years.

UPDATE, 5:10 P.M.: The museum has posted a statement on its Web site: “There are no words to express our grief and shock over today’s events at the Museum, which took the life of Officer Stephen Tyrone Johns. Officer Johns, who died heroically in the line of duty, served on the Museum’s security staff for six years. Our thoughts and prayers go out to Officer Johns’s family. We have made the decision to close the Museum Thursday, June 11, in honor of Officer Johns and our flags will be flown at half mast in his memory.”