A family spokesman says Angelo Dundee died surrounded by family at his home in Tampa, Fla.
Dundee, who was 90, was Muhammad Ali's corner man in his greatest fights. He also worked with Sugar Ray Leonard and helped George Foreman to become the oldest heavyweight champion at age 45.
Dundee's son Jimmy says his father lived long enough to attend Ali's 70th birthday bash in Louisville, Ky., last month.
Ali wrote in the foreword for Dundee's book that he allowed him to be exactly who he wanted to be, and that he loved Dundee. In an age of boxing when fighter-manager relationships rarely last, Dundee and Ali would never split.