Gary Webb, a prize-winning investigative journalist whose star-crossed career was capped with a controversial newspaper series linking the CIA to the crack cocaine epidemic in Los Angeles, died Friday of self-inflicted gunshot wounds, officials said. Mr. Webb, 49, was found dead in his Carmichael home Friday morning of gunshot wounds to the head, the Sacramento County Coroner's Office said Saturday. He left a note, but officials would not disclose its contents.