Age 66. The articles don't say much, just that it was unexpected. Cause not revealed. I think that an argument could be made that he was the greatest fighter of them all. He lost a controversial split decision to the equally great Sugar Ray Leonard and retired when Ray reportedly wouldn't give him a rematch. During my life, the Golden Era of boxing was the days of Hagler, Hearns, Leonard, Duran, Benitez and a few others at that time.