[OldMarksman]

what was the definitive proof that led to his conviction anyway?

1. Video that showed him returning to the building after having left for a place of safety, obtaining a second weapon, walking over to the victim, and firing multiple shots at him at point blank range;
2. forensic evidence indicating that the unarmed victim, though alive, had not been not moving and did not pose an imminent threat of death or serious bodily harm; and
3. multiple entry wounds fired at the victim while he was lying on the floor.