His death was confirmed by Bob Gunnell, a family spokesman.
Ali was the most thrilling if not the best heavyweight ever, carrying into the ring a physically lyrical, unorthodox boxing style that fused speed, agility and power more seamlessly than that of any fighter before him.
But he was more than the sum of his athletic gifts. An agile mind, a buoyant personality, a brash self-confidence and an evolving set of personal convictions fostered a magnetism that the ring alone could not contain. He entertained as much with his mouth as with his fists, narrating his life with a patter of inventive doggerel.
Ali was as polarizing a superstar as the sports world has ever produced — both admired and vilified in the 1960s and ’70s for his religious, political and social stances. His refusal to be drafted during the Vietnam War, his rejection of racial integration at the height of the civil rights movement, his conversion from Christianity to Islam and the changing of his “slave” name, Cassius Clay, to one bestowed by the separatist black sect he joined, the Lost-Found Nation of Islam, were perceived as serious threats by the conservative establishment and noble acts of defiance by the liberal opposition.
Loved or hated, he remained for 50 years one of the most recognizable people on the planet.
In later life Ali became something of a secular saint, a legend in soft focus. He was respected for having sacrificed more than three years of his boxing prime and untold millions of dollars for his antiwar principles after being banished from the ring; he was extolled for his un-self-conscious gallantry in the face of incurable illness, and he was beloved for his accommodating sweetness in public.
In 1996, he was trembling and nearly mute as he lit the Olympic caldron in Atlanta.
That passive image was far removed from the exuberant, talkative, vainglorious 22-year-old who bounded out of Louisville, Ky., and onto the world stage in 1964 with an upset victory over Sonny Liston to become the world champion. The press called him the Louisville Lip. He called himself the Greatest.
Ali also proved to be a shape-shifter — a public figure who kept reinventing his persona.
As a bubbly teenage gold medalist at the 1960 Olympics in Rome, he parroted America’s Cold War line, lecturing a Soviet reporter about the superiority of the United States. But he became a critic of his country and a government target in 1966 with his declaration “I ain’t got nothing against them Vietcong.”
“He lived a lot of lives for a lot of people,” said the comedian and civil rights activist Dick Gregory. “He was able to tell white folks for us to go to hell.”
But Ali had his hypocrisies, or at least inconsistencies. How could he consider himself a “race man” yet mock the skin color, hair and features of other African-Americans, most notably Joe Frazier, his rival and opponent in three classic matches? Ali called him “the gorilla,” and long afterward Frazier continued to express hurt and bitterness.