One of the greatest boxers in the history of the sport, Ali retired in 1981 and soon found signs of sluggishness and neurological damage. He thereafter received treatment for Parkinson's disease.
The death of Muhammad Ali, the legendary boxer and one of the best-known figures of the 20th century, has triggered an outpouring of affection and admiration from Bollywood celebrities.
Ali, who had long suffered from Parkinson's syndrome which impaired his speech and made the once-graceful athlete almost a prisoner in his own body, died on Friday at age 74.
The cause of death was septic shock due to unspecified natural causes, a family spokesman said on Saturday. Ali was admitted to a Phoenix-area hospital, HonorHealth, with a respiratory ailment on Monday.
"A legend no more," tweeted Lata Mangeshkar alongside an old photograph of herself with Ali and her niece, Rachana.
"(Muhammad) Ali the greatest ever! A gentleman and learned mind! He not just fought in the ring but outside it as well! And won!" wrote Amitabh Bachchan on his Twitter account.
Apart from them, many other celebrities took to various platforms to pay tribute to Ali.
Here is what they have to say: