Mike Tyson vs. Brian Nielsen Originally, Tyson was rewarded with a technical knockout victory, but it was later changed to a no-contest in January 2001 after a post-fight drug test revealed that Tyson had tested positive for marijuana. Just days before Tyson's positive test became known to the public, he was also issued a three-month suspension by the State of Michigan, which the Nevada Athletic Commission agreed to uphold, though the suspension had little effect on Tyson's boxing schedule as he had already announced his intentions to take those three months off. After serving the suspension, Tyson's next fight was initially going to be against
Mike Tyson round, Tyson was unexpectedly knocked out. After the fight, it was revealed that Tyson was trying to fight on one leg, having torn a ligament in his other knee in the first round. This was Tyson's fifth career defeat. He underwent surgery for the ligament four days after the fight. His manager, Shelly Finkel, claimed that Tyson was unable to throw meaningful right-hand punches since he had a knee injury. On June 11, 2005, Tyson stunned the boxing world by quitting before the start of the seventh round in a close bout against journeyman Kevin McBride. In the 2008 documentary