crime scene investigators found human blood around some new mulch at the home of kathleen dorsett. thleen down to the station and the chatty woman who just been serving him grapes just refused to talk. >> if you wish to -- >> okay. >> mark was the prosecutor assigned to the case. he had the blood along with the reports of screaming in the morning stephen disappeared. and the bad history between kathleen and stephen. but he wanted to nail down the details of the case, so he let her leave the station. >> we do not charge her yet. and the reason for that is that we wanted to sit back and figure out, was there more to the story? >> two days later, they made a decision. with police cameras rolling, the investigation team went back to kathleen's home. >> i remember walking up to the door, knocking on the door, thomas had answered it and invited me in. i told kathleen that she was under arrest for the murder of stephen moore. she was handcuffed and she was quickly escorted from the residents. >> the neighbors watched flabbergasted as kathleen door said, teacher, devoted mother, and daughte