As many of you likely already know, one of the greatest boxers in the history of the sport, Smokin' Joe Frazier, died yesterday (Mon., Nov. 7, 2011) due to liver cancer.

As the above video indicates, he was the only celebrity to ever appear at both Starrcade, the flagship pay-per-view for WCW, and WrestleMania, the flagship pay-per-view for WWE. He was the referee for the NWA world heavyweight championship match between Ric Flair and Dusty Rhodes at Starrcade '84 and was a cornerman for Mr. T at WrestleMania 2.

He made various other appearances, of course, but they pale in comparison. And his time dabbling in the world of professional wrestling is nothing compared to his many accomplishments as a professional boxer. Simply put, he was one of the greatest of all time.

WWE will be remembering him with its Classics on Demand service but if you would like to read plenty more about his legendary boxing career, head on over to see our friends at BadLeftHook.com. They've got comprehensive coverage on all things boxing and have been posting tributes to Frazier that you should definitely read.

RIP Smokin' Joe Frazier.