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3: Bret 'Hitman' Hart
Bret Hart may be an icon of the WWE and a former WWE Champion, but his career-ending injury did not come during his tenure there.
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Leaving the company in 1997 following the Montreal Screwjob, Hart joined WCW, capturing their world championship as well.
Look who just shut down all of Tony Khan's critics! More HERE.
It was as a part of the Atlanta-based promotion though, that his in-ring career would come to an end.
Meeting fellow future-Hall of Famer Bill Goldberg in the ring in 2000, Hart got hit with a swift kick to the head, causing a severe concussion.
After suffering from memory loss, Hart was diagnosed with post-concussion syndrome and faced no other choice than to retire.
Though the Hitman would compete at WrestleMania 26 against Vince McMahon, it was a street fight, and the Canadian legend was clearly not a wrestler anymore.
