Boxing legend and former undisputed middleweight champion, Marvelous Marvin Hagler died Saturday at age 66.

Hagler’s wife, Kay, confirmed the news with a post on her late husband’s Facebook fan page:

“I am sorry to make a very sad announcement, today unfortunately my beloved husband Marvelous Marvin passed away unexpectedly at his home here in New Hampshire. Our family requests that you respect our privacy during this difficult time. With love, Kay G. Hagler.”

It is unknown Hagler’s cause of death

Promoter Bob Arum and Top Rank later confirmed the news in a press release.

“Marvelous Marvin Hagler was among the greatest athletes that Top Rank ever promoted. He was a man of honor and a man of his word, and he performed in the ring with unparalleled determination. He was a true athlete and a true man. I will miss him greatly,” Arum said.

A 1993 inductee to the International Boxing Hall of Fame, Hagler made 12 defenses of the undisputed middleweight title he held from 1980 to 1987. Hagler had 62 wins, 3 losses and 2 draws, 52 KO’s. He was one of the most exciting and toughest boxers of all time.