On Nov. 7, 1997, Sheila Bellush, a mother of six, was brutally murdered in her Sarasota, Fla., home. Police found a multitude of clues at the scene, including fingerprints. Within weeks, three men had been arrested. But the crime was not a robbery, and the three men had never met Bellush before. Why would they want to kill her? Was it a murder for hire? Her ex-husband, wealthy San Antonio businessman Allen Blackthorne, frequently golfed with one of the men arrested in the crime. Witnesses say he was very angry at his ex-wife. Weeks before the murder, he hired a private investigator to locate Bellush. While the three men languished in jail, Blackthorne, who says he is innocent, continued to play golf. CBS News 48 Hours examines a case of murder, guilt and the intricacies of the criminal justice system. A Brutal Murder: Why would anyone want to murder Sheila Bellush? She was a wonderful woman and a devoted mother, her family says. Peter Van Sant reports from Sarasota, Fla.