frediani as the murderer. >> prosecutors believe frediani murdered helena in the mistaken belief thatdeath would end the sexual assault case against him. >> he wasn't smart enough to understand that just because he killed mrs. greenwood that her preliminary testimony was still going to be used. he didn't realize that. that was the error in his plan. >> he drove 500 miles from his home in san francisco to helena's home in san diego to stalk the couple and learn their schedules. his first mistake was getting into a car accident a few days before the murder, proof that he was in san diego before the crime. frediani learned that roger left for work every morning around 8:00 a.m., about an hour before helena. prosecutors believe frediani waited for helena outside her front gate. he was wearing gloves to avoid leaving fingerprints like he did when he assaulted helena a year earlier. when he heard helena close the front door, he made his move. frediani probably believed the gloves would protect him and didn't realize he left crucial forensic evidence behind. ironically, it was helena who gra