On May 7, 1998, my daughter, Shannon, a 23-year-old student at the Wharton School at the University of Pennsylvania in Philadelphia, was raped and killed by a man who broke into her apartment at 2 a.m. Her killer previously had raped at least four other women before Shannon, all students living alone within a six-block radius of Shannon's apartment, and all in early morning attacks.However, the police failed to realize they had a serial rapist on their hands because detectives had classified two of the cases as "non-criminal offenses" and failed to investigate. According to the police statements, they did not believe the victims or found the victim's memory of events unclear.