Boxing icon Muhammad Ali died on Friday, a family spokesman said in a statement.

Source: b'A picture taken 26 May, 1965, in Lewiston, Maineduring the world heavyweight boxing championship, at the end of which the American Muhammad Ali (Cassius Clay) (C) won against his compatriot Sonny Liston (R). AFP'

"After a 32-year battle with Parkinson’s disease, Muhammad Ali has passed away at the age of 74," spokesman Bob Gunnell said.

Ali, whose fame transcended sport during a remarkable heavyweight boxing career that spanned three decades, had been hospitalised in the Phoenix, Arizona, area with a respiratory ailment this week.

Here's how Twitter is reacting to the sad news:

Feature image: AFP