Former world heavyweight boxing champion Joe Frazier has died at his home in Philadelphia at the age of 67.
He had been suffering from liver cancer.
His family thanked people for their prayers, love and support and also requested time to grieve privately.
Frazier, who became known as "Smokin' Joe", won the Olympic heavyweight boxing gold medal for the United States in 1964 and held professional world heavyweight boxing titles from 1970 to 1973.
He is likely to be best remembered for his three epic fights with Muhammad Ali in the 1970s.
He handed Ali the first defeat of his pro career on 8 March, 1971, winning a 15-round bout at New York's Madison Square Garden billed as "The Fight of the Century."
He lost a rematch at the same venue in a 12-round decision on 28 January, 1974.
In one of the most famous sporting events of the 20th century, Frazier lost to Ali in a brutal encounter in the Philippines known as "The Thrilla in Manila" on a technical knockout when trainer Eddie Futch would not allow his charge to fight the 15th round.
Frazier retired in 1976 before staging an unsuccessful return in 1981.
He was inducted into the International Boxing Hall of Fame in 1990.
