The International Boxing Hall of Fame did not give a cause of death but said its flag will fly at half-staff in memory of Clancy, who was elected into the Hall in 1993.
While Clancy worked with some of the sport's best fighters, he was best known for his long association with another Hall of Famer, Emile Griffith, whom Clancy and Howie Albert guided to the welterweight and middleweight titles.
"Gil Clancy was one of boxing's truly great minds," Hall of Fame Executive Director Edward Brophy said in a statement.
"As a trainer and manager he was held in the highest regard by his peers."
- Related links