Abeed Al Mahmood has been identified as the suspect in the Washington Naval Yard shooting. Not much is known about him. He is identified as a 50 year old with some involvement with the Navy. One report has him as a Naval Officer while another has him as a civilian employee. He apparently had some job issues-- unclear if fired or retired.
UPDATE: Not clear if different person, but now id'd as Rollie Chance. More info here.