Floyd Patterson, who avenged an embarrassing loss to Ingemar Johansson by beating him a year later to become the first boxer to regain the heavyweight title, has died. He was 71.

Patterson died Thursday at his home in New Paltz, N.Y. He had Alzheimer's disease for about eight years and prostate cancer, nephew Sherman Patterson said.

Patterson's career was marked by historic highs and humiliating lows.

He emerged from a troubled childhood in Brooklyn to win the Olympic middleweight championship in 1952.

In 1956, the undersized heavyweight became at age 21 the youngest man to win the title with a fifth-round knockout of Archie Moore.

But three years later, Patterson was knocked down seven times in the third round in losing the title to Johansson at the Polo Grounds in New York City.

Patterson returned with a vengeance at the same site in 1960, knocking out Johansson with a tremendous left hook to retake the title.