the occupant was a deaf woman named daphne wright. >> daphne said that she had met darlene several timest the deaf apartments, that she had met her at the deaf club. >> 42-year-old daphne wright had no criminal record. during police questioning, wright denied any involvement. >> i didn't send any e-mails. it could have been a hacker. >> i don't believe the hacker story. i believe you sent the e-mails to her. you created an account with a different name and sent her the e-mails on those days, telling her to stay away from the deaf apartments. >> yeah, yeah, i did that. >> you created the name wendy smith? >> yes, i did that. >> a background check revealed daphne wright had been involved in a public altercation with darlene vandergiesen just five days before she disappeared. darlene was having dinner with sally ford, who was daphne wright's former lover. >> they had had an argument that the police had to be called to and she had to be escorted off the property. >> daphne wright told the police that she was jealous. she told police that she thought darlene was destroying her relationship wi

and it all led detectives in one direction, and that was toward daphne wright. >>> up next, a music teacher is found dead. is it an accident or murder? >> there were forensic teams going in and out of the house for days on end. >> luminol provides some answers. >> it just lit up like a christmas tree. it was phenomenal. >> she didn't have any enemies. that's why it was thought to be an intruder case. >> but sometimes, friends are more dangerous than enemies. >> secrets kept for years finally caused the whole thing to explode. ♪ >>> music played an integral part in the lives of ken fitzhugh and his wife, christine. >> they met as young people. and i think they shared a love of music. that's kind of what got their relationship going and they married a couple of years after that. >> ken and christine lived in palo alto, california, where they raised two sons. christine was a music teacher in the local public school. ken was a real estate consultant. life was going well for the couple until one day in 2000 when ken got a call from christine's school. >> christine had failed to show up for her 1