NEW : Police say first-degree murder charges are filed against 25-year-old Sian James . Police identify the deceased detective as Brian Stevenson . A man who was shot and killed by a police officer in an apparent robbery attempt has been identified as Detective Sgt. First-degree murder charges have been filed against a man who Baltimore , Maryland , police believe killed an off-duty detective by striking him in the head during a dispute over a parking space , authorities said Sunday . He was bludgeoned with a piece of concrete , police say .
NEW : Police say first-degree murder charges are filed against 25-year-old Sian James . Police identify the deceased detective as Brian Stevenson . A man who was shot and killed by a police officer in an apparent robbery attempt has been identified as Detective Sgt. He was bludgeoned with a piece of concrete , police say .