Muhammad Ali, left, appeared frail when he attended the Olympic Games in London two years ago

Ali, often regarded as one of the greatest fighters of all time, was diagnosed with Parkinson's syndrome in 1984 and speculation has been rife in recent years that his condition is deteriorating. He appeared frail while attending the opening ceremony of the London 2012 Olympics, while his brother, Rahman, said in an interview in February last year that his sibling could die within days.

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