Raja Jackson, a light heavyweight fighter, lifts Smith—who looks significantly heavier than him—high in the air before slamming him down, and raining blows on him

Raja Jackson, a light heavyweight fighter, lifts Smith—who looks significantly heavier than him—high in the air before slamming him down, and raining blows on him

Raja Jackson, a light heavyweight fighter, lifts Smith—who looks significantly heavier than him—high in the air before slamming him down, and raining blows on him

Former UFC wrestler Quinton "Rampage" Jackson's fight on Sunday with independent wrestler Stuart Smith (ring name: Syko Stu) took a turn for the worse after his son Raja Jackson suddenly entered the ring and assaulted Smith in the name of a planned "payback".

In a viral video from the Knokx Pro Wrestling event in Los Angeles, California, the 25-year-old Mixed Martial Arts (MMA) fighter can be seen suddenly entering the ring, right as his father rolls away after getting hit with a small body slam.

Raja, a light heavyweight fighter, lifts Steve—who looks significantly heavier than him—high in the air before slamming him down. He then quickly got on top of Smith—who was unresponsive by then—and rained about twenty blows on his face before he was restrained.

Amid criticism for the move, Quinton defended his son by saying that it was part of a planned "payback" that he thought was part of the show.

(This is a developing story.)