Jim Dundee told The Miami Herald Angelo Dundee died in Clearwater of a heart attack.
Angelo Dundee also worked as trainer for Sugar Ray Leonard and was in the corner for George Foreman when Foreman won the world heavyweight title in 1994 at age 45.
The Herald said Dundee suffered a blood clot during his return trip from celebrating Ali's 70th birthday in Louisville, Ky. After receiving treatment at a hospital, he was transferred to a rehabilitation center.
"He was recuperating and coming along quite well," Jim Dundee told the newspaper. "He was already making plans to take a trip to Las Vegas for another event in two weeks."
Angelo Dundee was hired by Ali in 1960 and was with him for 20 years. He was inducted into the Boxing Hall of Fame in 1992.