Raja Jackson, the son of former UFC light heavyweight champion Quinton "Rampage" Jackson, went beast mode during a match Saturday night ... violently attacking his competitor with blows to the head despite him already being knocked out.
The disturbing footage from the event's Kick livestream shows the victim -- Stuart Smith, whose ring name is Syko Stu -- being slammed to the ground ... a move that seemingly knocked him out cold. Raja then mounts his unresponsive body, delivering hit after hit until he's pulled off.
The incident occurred at a private wrestling event by KnokX Pro Academy in Los Angeles, and according to wrestling reporter Sean Ross, Syko ended up in the hospital.