"The Greatest Of All Time": Muhammad Ali's Life In Pictures

Muhammad Ali at age 12.

Ali in his professional boxing debut against Tunney Hunsaker on October 29, 1960, in Louisville's Freedom Hall.

Ali at City Parks Gym in New York in Feb. 1962.

Muhammad Ali training in his gym in May 1965.

Ali stands over fallen challenger Sonny Liston after a short hard right to the jaw on May 25, 1965, in Lewiston, Maine.

Heavyweight champion Ali speaks to the Illinois Athletic Commission on Feb. 25, 1966 in Chicago.

Ali sings with Johnny Carson, host of NBC's "Tonight" show, in February 1967 in New York.

Ali, left, and Dr. Martin Luther King speak with reporters on March 29, 1967 in Louisville, Ky.

Ali speaks at an anti-war rally at the University of Chicago on May 11, 1967.

Ali addresses a gathering at a Black Muslim convention in Chicago.

Heavyweight champion Joe Frazier, left, pushes Muhammad Ali into the ropes during the fourth round of their heavyweight title bout on March 8, 1971 in New York.

George Foreman takes a right to the head from Ali in the 7th round in the boxing match dubbed "Rumble in the Jungle" in Kinshasa, Zaire.

Ali punches Hungarian-born British boxer Joe Bugner in their title fight at the Merdeka Stadium in Kuala Lumpur. Ali won the fight, keeping his World Heavyweight title.

Ali delivers a left and right to Joe Frazier in the 14th round of their title fight on Oct. 1, 1975 in Manila. Moments later, Frazier's trainer signaled to the referee to stop the fight and Ali retained his heavyweight title.

Ali kisses his newborn daughter on Dec. 30, 1977 in Miami Beach.

Muhammad Ali and his with wife, Veronica attend a Los Angeles Lakers game on Sept. 6, 1979.

Muhammad Ali, Liberace, and Hulk Hogan get together at Madison Square Garden in preparation for their upcoming wrestling event on March 29, 1985.

Ali is surrounded by hundreds of Chinese school children during a visit to Beijing on Feb. 25, 1993.

Ali participates in a ceremony for the holy month of Ramadan in the Royal Palace in Rabat, Morocco, in January 1996.

Ali holds the torch before lighting the Olympic Flame during the Opening Ceremony of the 1996 Centennial Olympic Games in Atlanta.

Ali speaks with boxer Mike Tyson at the University of Nevada, Las Vegas (UNLV) student union ballroom in 1996.

Ali embraces Prince during a meeting in Washington in June 1997 ahead of a news conference where they were to announce plans for a benefit concert.

Ali receives the Sports Illustrated 20th Century Sportsman of the Century Award in New York in Dec. 1999.

Ali is greeted by singer Whitney Houston as he arrives on stage at New York's Radio City Music Hall to accept a GQ "Men of the Year" Award on Oct. 21, 1998. Ali received GQ's courage award.

Ali is accompanied by his daughters Mya Mya, left, and Hana at the premiere of the film "The Original Kings of Comedy" in Los Angeles on Aug. 10, 2000.

Muhammad Ali poses with his daughter Laila after she beat Suzy Taylor to win the IBA Super Middleweight title on Aug. 17, 2002 at the Aladdin Hotel in Las Vegas.

Ali receives the Presidential Medal of Freedom from President George W. Bush in Nov. 2005 in the East Room of the White House.

Muhammad Ali arrives to see his daughter Laila fight Asa Maria Sandell from Sweden in Berlin on Dec. 17, 2005.

Ali poses with Carrie Underwood during Celebrity Fight Night XXII in Phoenix on April 8, 2016.