Our colleagues at BBC Sport have all the latest tributes and reaction to the death of Muhammad Ali.
Hana Ali has also posted photographs of her late father on her Instagram page.
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At the 1960 Rome Olympics, Muhammad Ali - then Cassius Clay - won the gold medal for light heavyweight boxing.Copyright: Allsport/Getty Images
When the Olympics came to Atlanta in 1996, Ali - who had been diagnosed with Parkinson's Syndrome in 1984 - was watched by billions around the world as he lit the Olympic cauldron.Copyright: Getty Images
Ali, who had thrown his original gold medal into the Ohio River when he was criticised for not fighting in Vietnam, received a replacement medal at the 1996 Atlanta Olympics.Copyright: Getty Images
And at the most recent Olympic Games, at London in 2012, Ali made a special appearance to be a flag bearer.
Muhammad Ali appeared on Michael Parkinson's chat show four times.
In this 1974 clip, at the peak of his career, Ali speaks movingly about the reasons why he fights.
The BBC's Nick Bryant on why Ali is the Greatest, the man who changed his sport and his country
Ali turned bragging into an art form, the Los Angeles Times says. "I'm so mean I make medicine sick," he once quipped, and "I'm so fast that last night I turned off the light switch in my hotel room and was in bed before the room was dark."
- Copyright: AFP/GettyQuote Message: Hillary and I are saddened by the passing of Muhammad Ali. From the day he claimed the Olympic gold medal in 1960, boxing fans across the world knew they were seeing a blend of beauty and grace, speed and strength that may never be matched again.Quote Message: We watched him grow from the brash self-confidence of youth and success into a manhood full of religious and political convictions that led him to make tough choices and live with the consequences. Along the way we saw him courageous in the ring, inspiring to the young, compassionate to those in need, and strong and good-humored in bearing the burden of his own health challenges.Quote Message: I was honored to award him the Presidential Citizens Medal at the White House, to watch him light the Olympic flame, and to forge a friendship with a man who, through triumph and trials, became even greater than his legend. Our hearts go out to Lonnie, his children, and his entire family.
Ali will be remembered as much for his rhymes as boxing, The Washington Post says, which he used to belittle his opponents and embellish his own abilities.
“This is the legend of Cassius Clay, the most beautiful fighter in the world today,” the paper quotes him saying before his 1964 title bout.
“The brash young boxer is something to see, and the heavyweight championship is his destiny.”
The BBC's Joe Wilson takes a look back at the life and career of Muhammad Ali. You can watch the video obituary above.
Ali was the most thrilling if not the best heavyweight ever, The New York Times says, 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," the paper says. "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."
Figures from the world of boxing and beyond have been paying tribute to Muhammad Ali since the news of his death at the age of 74 broke earlier this morning.
Don King describes it as a "sad day for life", while Manny Pacquiao says: "We lost a giant today".
We're collating the tributes as they come in - read more here.Copyright: Getty Images
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From our archive: Former US President Bill Clinton told BBC 5 live in 2011
"The courage Muhammad Ali showed as an older man in later life battling Parkinson's Disease was every bit as great as that showed earlier in his boxing career when he risked having his body, brain and face regularly being battered."
World cruiserweight champion Tony Bellew tells BBC 5 Live:Quote Message: He was the ultimate hero. It's heartbreaking news to wake up to. The greatest sportsman of all-time in my opinion. He transcended the sport and this is a sad day. I hope something can be named after him. He can never be replicated.
Promoter Eddie Hearn says on Sky Sports News: "Icon is a word that gets bandied around but it's the best word to use to describe Muhammad Ali. He transcended the sport."
He adds:Quote Message: He lived and stood for so many things, and was someone who was instantly recognisable. He was a true legend of the sport and after a long period of suffering, he rests in peace now, God willing. It's a really sad day for boxing and he was a man that did so much for the game.
Here are just a few of the many pictures from Ali's incredible career.Copyright: Reuters