Mike Tyson was a boxer until 2001.
Michael Gerard Tyson ( [ ˈtaɪsən ] born June 30 , 1966 ) is an American former professional boxer who competed from 1985 to 2005 . In 2002 , Tyson fought for the world heavyweight title again at the age of 35 , losing by knockout to Lennox Lewis . Tyson retired from professional boxing in 2006 , after being knocked out in consecutive matches against Danny Williams and Kevin McBride .