Story highlights Dundee was inducted into the International Boxing Hall of Fame in 1992

He trained Muhammad Ali and Sugar Ray Leonard

'Dad lived a great life, and he did a great job living it," his son told CNN affiliate WFTS

Legendary cornerman Angelo Dundee, the man who helped motivate Muhammad Ali and many other boxing champs, died Wednesday, a source close to Ali said.

He was 90. Dundee died Wednesday in Florida from natural causes, Dundee's son Jimmy Dundee told CNN affiliate WFTS

Dundee, known for being a supreme motivator, was inducted in the International Boxing Hall of Fame in 1992. His biography on its website reads like a who's who list of boxing royalty.

He was hired to be Ali's trainer and cornerman in 1960 back when the brash-talking, quick-jabbing boxer went by the name Cassius Clay. Dundee was there through Ali's historic name change, his brawls with George Foreman, "Smokin" Joe Frazier, Ken Norton and Leon Spinks.

He was there all the way toward the end of Ali's career in his punishing loss to Larry Holmes in 1980. After watching Ali get battered for round after round, Dundee stopped the fight after the 10th round fighting off objections from others in the corner and the bruised and puffy-eyed Ali.

Photos: Muhammad Ali: 'The Greatest' at 70 Photos: Muhammad Ali: 'The Greatest' at 70 Golden moment – Cassius Clay, later to become known as Muhammad Ali, rose to prominence at the 1960 Olympic Games in Rome, where he claimed a boxing gold medal in the light heavyweight division. Hide Caption 1 of 6 Photos: Muhammad Ali: 'The Greatest' at 70 High five – Ali boldly predicted how many rounds it would take him to knock out British boxer Henry Cooper ahead of their bout in London in 1963. The fight was stopped in the fifth round as Cooper was bleeding heavily from a cut around his eye and Ali was declared the winner. Cooper died in May 2011. Hide Caption 2 of 6 Photos: Muhammad Ali: 'The Greatest' at 70 I'm the greatest – Ali first became a world champion in 1964, when he was still known as Cassius Clay. He upset the odds to defeat reigning champion Sonny Liston, a result which prompted him to yell "I'm the greatest" at gathered reporters. Hide Caption 3 of 6 Photos: Muhammad Ali: 'The Greatest' at 70 Rumble in the Jungle – In 1974, Ali took part in one of the most famous world championship fights in the history of boxing. He took on reigning champion George Foreman in Zaire, in a fight which was dubbed the "Rumble in the Jungle." Ali emerged victorious after flooring Foreman in the eighth round. Hide Caption 4 of 6 Photos: Muhammad Ali: 'The Greatest' at 70 Let the Games begin – Ali provided one of the iconic images of the 1996 Atlanta Olympics when he lit the Olympic flame to officially declare the Games open. Hide Caption 5 of 6 Photos: Muhammad Ali: 'The Greatest' at 70 Regaining gold – In addition to lighting the flame, Ali also received a replacement gold medal for the one he had won 36 years earlier. Ali tossed the original into the Ohio River after being refused entry to a restaurant. Hide Caption 6 of 6

Loquacious sports analyst Howard Cosell described the scene in the corner this way.

"This fight should be stopped. Angelo is telling the referee to stop it. He would not give in. Angelo Dundee. He cared about his fighter too much."

Dundee was also in the corner of Sugar Ray Leonard giving sage advice during some of Leonard's most memorable fights.

During Leonard's 1981 battle with Tommy Hearns, Dundee uttered the emphatic phrase that some say spurred the listless boxer to a dramatic comeback. Sensing that Leonard was behind on the judge's scorecards before the 13th round, Dundee leaned close to Leonard and said in a fatherly tone: "You're blowing it now son! You're blowing it."

Leonard snapped out of it and knocked Hearns out in the 14th round to gain another welterweight championship.

Dundee started his career training Hall Fame boxer Carmen Basilio and also trained champs Jimmy Ellis, Luis Rodriguez, Sugar Ramos, Ralph Dupas and Willie Pastrano.

"Dad lived a great life, and he did a great job living it," Jimmy Dundee told WFTS.