Described as a gentle, caring man, Bill Flint was an electrical engineer near Houston, Texas, who spent his life cheating death: he was shot, the bullet passing through his neck; then a hit man was hired to kill him; and he even survived a serious workplace accident. So, when he suddenly became violently ill and died of an apparent heart attack on May 3, 2002, Bill Flint's friends and family couldn't help wondering, was it murder? Correspondent Richard Schlesinger reports.