Muhammad Ali, “The Greatest” boxer in history, died on Friday at the age of 74.
'The Greatest' Muhammad Ali Dies at 74

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FILE - Heavyweight champion Muhammad Ali stands over fallen challenger Sonny Liston, shouting and gesturing shortly after dropping Liston with a short hard right to the jaw, in Lewiston, Maine, May 25, 1965.

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FILE - Heavyweight boxing champion Muhammad Ali is escorted from the Armed Forces Examining and Entrance Station in Houston by Lt. Col. J. Edwin McKee, after Ali refused Army induction, April 28, 1967. Ali died at age 74, June 3, 2016.

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FILE - Muhammad Ali speaks to Muslims holding a book called "Towards Understanding Islam" written by Sayyid Abul Ala Maududi in London, Britain, May 1966. Ali died late Friday in Phoenix, Arizona, June 3, 2016.

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FILE - World heavyweight boxing champion Muhammad Ali, right, and Black Muslim leader Malcolm X in New York City, March 1, 1964. Ali died Friday in Phoenix, Arizona, at age 74.