It appears Raja Jackson has ended Syko Stu 's time in the squared circle ... as one of the wrestler's good friends tells TMZ Sports he's sure Stu's in-ring time is over following the violent attack.

Douglas Malo -- who actually helped rip Jackson off of Stu during his outburst at a Knokx Pro Wrestling event back in August -- sat down with us this week after prosecutors officially levied charges on Quinton "Rampage" Jackson 's son ... and he told us he can't see Stu ever mixing it up between the ropes again. Play video content

Malo said the wrestler -- real name Stuart Smith -- simply took too much damage from Raja to even try to make a comeback.

"I don't even think it would be smart at this point," Malo said.

Malo added Stu had already been dealing with the effects of a

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