Investigators say Jackson was enraged about gunfire at a gas station where he was parked with his children in his vehicle. Prosecutors say Jackson later went to an apartment where he thought the people responsible for the gunfire might be found.
Jackson fired through a window, fatally shooting random victim McCullough, who was at a birthday party.
Jackson in 1998 was sentenced to eight years in prison for the fatal beating of a man in an alleged drug deal.
