Please follow the latest updates on our Sport live pagepublished at 09:29 British Summer Time 4 June 2016
Our colleagues at BBC Sport have all the latest tributes and reaction to the death of Muhammad Ali.
Summary
Boxing legend Muhammad Ali has died, aged 74, a family spokesman has said
He was admitted to hospital in Phoenix, Arizona, on Thursday with a respiratory illness
His funeral will take place in his hometown of Louisville, Kentucky
The former heavyweight champion was diagnosed with Parkinson's Disease in 1984
Please follow the latest updates on our Sport live pagepublished at 09:29 British Summer Time 4 June 2016
Hana Ali shares photographs of her late fatherpublished at 09:24 British Summer Time 4 June 2016
Hana Ali has also posted photographs of her late father on her Instagram page.
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End of instagram post 3Muhammad Ali and the Olympicspublished at 09:22 British Summer Time 4 June 2016
Image source, Getty ImagesAt the 1960 Rome Olympics, Muhammad Ali - then Cassius Clay - won the gold medal for light heavyweight boxing.
Image source, Allsport/Getty ImagesWhen 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.
Image source, Getty ImagesAli, 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.
Image source, Getty ImagesAnd at the most recent Olympic Games, at London in 2012, Ali made a special appearance to be a flag bearer.
Ali's daughter: 'Our father was a humble mountain'published at 09:20 British Summer Time 4 June 2016
Hana Ali tweets...
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End of twitter postListen: George Foreman speaks on BBC Radio 4's Today programmepublished at 09:16 British Summer Time 4 June 2016
Media caption, George Foreman pays tribute to his boxing opponent and close friend, Muhammad Ali
Trump: Ali 'will be missed by all'published at 09:16 British Summer Time 4 June 2016
Republican presumptive nominee tweets...
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End of twitter postWatch: Michael Parkinson interview with Muhammad Alipublished at 09:15 British Summer Time 4 June 2016
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.
Why Ali is The Greatestpublished at 09:14 British Summer Time 4 June 2016
The BBC's Nick Bryant on why Ali is the Greatest, the man who changed his sport and his country
'Bragging into an art form'published at 09:14 British Summer Time 4 June 2016
Ali turned bragging into an art form, the Los Angeles Times, external 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."
Bill Clinton: Ali 'became greater than his legend'published at 09:11 British Summer Time 4 June 2016
Image source, AFP/GettyQuote MessageHillary 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 MessageWe 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 MessageI 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's rhymes rememberedpublished at 08:55 British Summer Time 4 June 2016
Ali will be remembered as much for his rhymes as boxing, The Washington Post, external 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.”
Watch: Muhammad Ali's life and careerpublished at 08:53 British Summer Time 4 June 2016
The BBC's Joe Wilson takes a look back at the life and career of Muhammad Ali. You can watch the video obituary above.
'More than the sum of his athletic gifts'published at 08:53 British Summer Time 4 June 2016
Ali was the most thrilling if not the best heavyweight ever, The New York Times, external 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."
Tributes being paid to Muhammad Alipublished at 08:42 British Summer Time 4 June 2016
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.
Image source, Getty ImagesHatton: 'It was an honour to meet Ali'published at 08:41 British Summer Time 4 June 2016
British boxer tweets...
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End of twitter postKhan tweets tribute to Alipublished at 08:32 British Summer Time 4 June 2016
Two-time former world champion tweets...
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End of twitter post'More courageous in later life'published at 08:32 British Summer Time 4 June 2016
Image source, Getty ImagesFrom 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."
Muhammad Ali was 'the ultimate hero'published at 08:26 British Summer Time 4 June 2016
World cruiserweight champion Tony Bellew tells BBC 5 Live:
Quote MessageHe 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.
Ali 'did so much for the game'published at 08:20 British Summer Time 4 June 2016
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 MessageHe 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.
Muhammad Ali: In picturespublished at 08:15 British Summer Time 4 June 2016
Here are just a few of the many pictures from Ali's incredible career.
Image source, Reuters
Image source, ReutersImage caption, Ali beat Henry Cooper at Wembley Stadium in June 1963
Image source, ReutersImage caption, Ali with his trainer Angelo Dundee ahead of his fight with Ernie Terrell in Texas in February 1967
Image source, AFP/GettyImage caption, George Foreman and Ali fought in the 'Rumble in the Jungle' in Zaire in October 1974