The First 48 (2004) : 6x9

In Dallas, a man is shot to death while trying to protect a friend outside a crowded nightclub. With little physical evidence to go on, Detective Robert Quirk must convince reluctant witnesses to tell him who pulled the trigger. In Detroit, a warm spring day turns deadly when a basketball game erupts in violence. To discover who fired the fatal shot, it's up to Officer Jo Ann Miller to track down the players one by one.