Tyson became the youngest heavyweight champion in history when he won the World Boxing Council (WBC) title in 1986 at the age of just 20 and went on to become the most famous boxer on the planet by the late 1980s when he became undisputed heavyweight champion of the world.
But his career achievements were later overshadowed by his controversial personal life, including his allegedly abusive marriage to actress Robin Givens and his jail stint for rape in the 1990s.
Tyson recently admitted to a raging drug habit, which he only kicked after the death of his daughter last year (09), and although he is adamant he never took illegal substances during his time as a professional boxer, he admits he was frequently drunk, even at the height of his career.
He tells TV talk show host Larry King, "I've always been addicted. I wasn't using drugs when I was boxing, when I started. But... I never considered alcohol is a drug, too. But I would get drunk after every fight. I said I'm off drugs 14 years but really I wasn't. So that wasn't really true. I was just lying to myself. I would get drunk after every fight, just blasted."