WASHINGTON (AP) — The lawyer for relatives of a black motorcyclist who was fatally shot by a District of Columbia police officer says many unanswered questions surround his death.

Thirty-one-year-old Terrence Sterling of Fort Washington, Maryland, was killed on Sept. 11 at a downtown Washington intersection. Police said he was shot after he intentionally rammed the passenger-side door of a police car while trying to flee a traffic stop.

The officer who shot Sterling was wearing a body camera but didn’t activate it until after the shooting. Police have not disclosed the race of the officer.

Attorney Jason Downs said Thursday that he and Sterling’s relatives were shown additional body camera footage. He says the footage shows a police union representative arriving on the scene to assist the officer who shot Sterling.