Marvelous Marvin Hagler, the middleweight legend and one of the greatest fighters in boxing history, died on Saturday in New Hampshire. He was 66.

Hagler’s death was announced on the verified Marvelous Marvin Hagler Facebook Fan Club page with a message from Hagler’s wife, Kay G. Hagler.

“I am sorry to make a very sad announcement,” she wrote. “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.”

One of Hagler’s sons, James, told TMZ that his father was taken to the hospital earlier on Saturday after experiencing breathing problems and chest pains.

Hagler, who boxed from 1973 to 1987 and was one of the famed round-robin of fights among the “Four Kings” of the 1980s along with Sugar Ray Leonard, Thomas Hearns and Roberto Duran, took years to make his name because nobody would give him a chance to fight for a middleweight world title until he was deep into his career