Marvelous Marvin Hagler stopped Thomas Hearns in a fight that lasted less than eight minutes yet was so epic that it still lives in boxing lore. Two years later he was so disgusted after losing a decision to Sugar Ray Leonard — stolen, he claimed, by the judges — that he never fought again. One of the great middleweights in boxing history, Hagler died Saturday at the age of 66. His wife, Kay, announced his death on the Facebook page for Hagler’s fans. Hagler fought on boxing’s biggest stages against its biggest names, as he, Leonard, Hearns and Roberto Duran dominated the middleweight classes during a golden time for boxing in the 1980s. Quiet with a brooding public persona, Hagler fought 67 times over 14 years as a pro out of Brockton, Massachusetts, finishing 62-3-2 with 52 knockouts. Hagler was unmistakable in the ring, fighting out of a southpaw stance with his bald head glistening in the lights. He was relentless and he was vicious, stopping opponent after opponent during an eight-year run that began with a disputed draw against Vito Antuofermo in 1979 that he later avenged.