An unarmed black man killed by a white Oklahoma officer who was responding to a stalled vehicle can be seen in police video walking away from officers and toward his SUV with his hands up before he approaches the driver's side door, where he drops to the ground after being shocked with a stun gun then fatally shot.

In Tulsa police helicopter footage that was among several clips released on Monday showing the shooting of 40-year-old Terence Crutcher and its aftermath, a man in the helicopter that arrives above the scene as Crutcher walks to the vehicle can be heard saying "time for a Taser". He then says: "That looks like a bad dude, too. Probably on something."

Police Chief Chuck Jordan announced before the video's release that Crutcher had no weapon on him or in his SUV when he was shot on Friday. It's not clear from the footage what led Betty Shelby, the officer who fired the fatal shot, to draw her gun or what orders officers might have given Crutcher. Local and federal investigations are under way to determine whether criminal charges are warranted in the shooting or if Crutcher's civil rights were violated.