Marvelous Marvin Hagler (born Marvin Nathaniel Hagler; May 23, 1954 – March 13, 2021) was an American professional boxer and film actor who competed in boxing from 1973 to 1987. He reigned as undisputed champion of the middleweight division from 1980 to 1987, defeating eleven fighters for the title, all but one by knockout, and making twelve successful title defenses. Hagler also holds the highest knockout percentage of all undisputed middleweight champions at 78 percent. His undisputed middleweight championship reign of six years and seven mo…