Marvelous Marvin Hagler (born Marvin Nathaniel Hagler; May 23, 1954 – March 13, 2021) Professional boxer and film actor who competed in boxing from 1973 to 1987. He reigned as undisputed middleweight champion from 1980 to 1987, making twelve successful defenses of that title, and holds the highest knockout percentage of all undisputed middleweight champions, at 78 percent, while also holding the third-longest unified championship reign in boxing history at twelve consecutive defenses.