He wasn't put to sleep, he was TKO'd. He finished all his fights on his feet by himself. This is K.O'd This content is protected
You rarely see a KO where a guy is unconscious for an extended period of time. A KO in boxing is when the referee reaches a count of 10 before a fighter gets up from a knockdown. Liston KO'd Patterson, twice. Patterson was very undersized for a HW, his chin might have been concrete at LHW but he was on the canvas and hurt a lot as a HW. He had amazing heart however and always got up or tried to get up.