CIRCA 1960: Many poses of Muhammad Ali.
MAY 1962: Cassius Clay poses for a portrait in May 1962.
1964: Heavyweight Boxing Champion of the World, Cassius Clay, who later changed his name to Muhammad Ali.
Portrait of American boxer Cassius Clay (who changed his name to Muhammad Ali in 1964) as he raises his fists above his head and growls fiercely, early 1960s.
American Heavyweight boxer Cassius Clay (later Muhammad Ali), training in his gym, 21st May 1965.
UNITED KINGDOM - AUGUST 06: The American boxer Muhammad ALI kept his heavyweight world champion title by beating the British boxer Brian LONDON in London, on the third round.
Heavyweight champion Cassius Clay (left) focuses his whammy eye on challenger Ernie Terrell during the weigh in for tonight's title fight, Houston, Texas, February 6, 1967.
Heavyweight boxer Muhammad Ali addresses a race rally during the peace rally at the Civic Center in San Francisco, 27th April 1968.
Cassius Clay arrives in Los Angeles to train, in August 1969 in Los Angeles,California.
Heavyweight boxer Muhammad Ali trains for his fight against Oscar Bonavena on December 7, 1970 in New York, U.S.A.
A picture taken March 08 1971 in New York at the Madison Square Garden of the heavyweight boxing world championship fight between Muhammad Ali (Cassius Clay) (on the floor) and Joe Fazier at the end of which Frazier kept his title of heavyweight boxing world champion.
LAS VEGAS - JUNE 27,1972: Muhammad Ali gets weighed during a press conference before his fight against Jerry Quarry at the Convention Center, Las Vegas, Nevada. Muhammad Ali won the NABF heavyweight title by a TKO 7.
INGLEWOOD,CA - SEPTEMBER 10,1973: Muhammad Ali (R) lands a punch against Ken Norton during the fight at Forum in Inglewood, California. Muhammad Ali won the NABF heavyweight title by a SD 12.
Former world heavyweight champion Muhammad Ali is seen during a training session on September 28, 1974 in Kinshasa, Zaire, before his world heavyweight championship fight against champion in title George Foreman on October 30, 1974. Ali won by knocking out Foreman in the eighth round.
A general view of "The Match of the Century " between the former world heavyweight boxing champion the American Muhammad Ali (R) and his compatriot and titleholder George Foreman (L). Ali won and got back his title October 30, 1974 in Kinshasa, Congo.
OCTOBER 1975 : Ring Magazine Cover - Muhammad Ali and Joe Frazier on the cover.
Boxing & Professional Wrestling: Japan Kanji Antonio Inoki in action vs heavyweight champion Muhammad Ali during exhibition match at Nippon Budokan, Fight ended as draw, Tokyo, Japan 6/26/1976
Picture taken in Moscow September 16, 1978, of the world heavyweight boxing champion Muhammad Ali (L) during the match he won against his compatriot Leon Spinks.
Muhammad Ali & wife Veronica
LAS VEGAS - OCTOBER 2,1980: Larry Holmes (R) moves in for the punch against Muhammad Ali during the fight at Caesars Palace in Las Vegas, Nevada. Larry Holmes won the WBC heavyweight title by a RTD 10.
Heavyweight Boxing: Closeup of Trevor Berbick (R) in action, throwing punch vs Muhammad Ali (L) December 11, 1981, at Queen Elizabeth Sports Centre, Nassau, Bahamas, Ali's final fight.
Former boxer Muhammad Ali and celebrity actor Mr. T talk to fans before the IBF Heavyweight Title fight with Michael Spinks and Larry Holmes on September 21, 1985 at the Riviera Hotel & Casino in Las Vegas, Nevada.
CANASTOTA,NY - JUNE 9,1990: Muhammad Ali and Willie Pep looks on during the 1990 Boxing Hall of Fame induction ceremony in Canastota, New York.
Muhammad Ali and Madonna
Former 1968 Olympic gold medalist Muhammad Ali lights the first torch to start the Olympic Torch Relay 04 December 2001, at Centennial Olympic Park in Atlanta, Georgia.
Boxing legend Muhammad Ali holds a replica plaque at ceremony honoring him with a star on the Hollywood Walk of Fame January 11, 2002 in Hollywood, CA.
US President George W. Bush (R) presents the Presidential Medal of Freedom, the nation's highest civil award,to boxer Muhammad Ali in the East Room of the White House 09 November 2005 in Washington, DC. The medal is presented to those who have made contributions to national security, world peace, or culture.It was Ali's first public appearance in five months. The last was also in Washington when he watched his daughter Leila Ali fight in a women's boxing bout.
Muhammad Ali attends an intimate evening with David Foster and Friends in support of organ donor awareness at a private home on November 19, 2010 in Toronto, Canada.
Muhammad Ali with Moet & Chandon at Celebrity Fight Night XIX at JW Marriott Desert Ridge Resort & Spa on March 23, 2013 in Phoenix, Arizona.
Muhammad Ali attends the 2014 Muhammad Ali Humanitarian Awards at the Louisville Marriott Downtown on September 27, 2014 in Louisville, United States.