 In the summer of 2011 , <unk> announced that he was returning to action , stating , " I feel like a new man . <unk> . Strong . I feel like I used to feel " . His return match was scheduled to be at <unk> 141 on December 30 in Las Vegas against former <unk> heavyweight champion <unk> <unk> . <unk> won the fight by way of technical knockout in the first round . The result of the fight remains controversial , as <unk> tested positive for elevated levels of <unk> prior to his next fight . <unk> then announced his retirement from <unk> , mentioning his struggles with <unk> and saying " tonight was the last time you 'll see me in the <unk> " . 
