Three-time world boxing champion Hector "Macho" Camacho died Saturday, four days after he was wounded in the face in a drive-by shooting, doctors said. He was 50. Camacho was pronounced dead after being taken off life support following a second heart attack early Saturday morning at Puerto Rico Medical Center in San Juan. He had been declared brain dead on Thursday after he was shot Tuesday while sitting in a car outside a liquor store in the San Juan suburb of Bayamon, Camacho's birthplace. Obituary, Page B9 . . . Former world champion Ricky Hatton, in his first fight after more than three years in retirement, was stopped in the ninth round by Vyacheslav Senchenko in Manchester, England. The 34-year-old Hatton (45-3), who took a painful body shot from the Ukrainian welterweight in the ninth, hastily retired again after the fight.