During a career that spanned six decades, it was Dundee's work with Ali that shot him to fame, having been recruited in 1960 to guide the then-Cassius Clay, already an Olympic champion, to professional success.

Dundee died following a heart attack on Thursday at a rehabilitation centre in Clearwater, Florida, the Miami Herald reported yesterday, having initially been admitted to the hospital with a blood clot two weeks ago.

The trainer's son, Jimmy, said that his father died with his family beside him. ``It was the way he wanted to go. He did everything he wanted to,'' he said.

Dundee was in the corner when his heavyweight protege first became world champion by defeating Sonny Liston in 1960.

He also guided him in all three fights against ``Smoking Joe'' Frazier, and in the infamous fight where Ali regained the belt against George Foreman in 1974.

Together they crafted the ``rope-a-dope'' technique which helped Ali dethrone Foreman with a blistering set of punches during ``the Rumble in the Jungle,'' in Zaire, which was called the fight of the year by The Ring Magazine.

Dundee, who was born in Philadelphia, worked with Ali right up until his final bout against Trevor Berbick in 1981 - a fight in which the legend looked overweight and slow, and was outpunched by his opponent.

Their friendship continued long after they left the ring, and Dundee was with Ali when the heavyweight legend celebrated his 70th birthday last month in Louisville, Kentucky.

Dundee was considered a quick thinker and the best fight strategist in the sport. He began working with Leonard in 1976 before helping Foreman win back the heavyweight title in 1994 at the age of 45.

With Leonard, who had been out of the ring for three years, Dundee ended the middleweight dominance of ``Marvellous'' Marvin Hagler in 1987, a win attributed in part to the trainer spotting a flaw in the latter fighter's stance.