like she just put her trust in everyone, and you cannot do that. >> ken otto was tried and convicted murder and tampering with evidence. >> at the end of the day, he's a cold-blooded killer. whatever you say, mr. otto, you can stand up. on the count of murder, into the custody of commissioner of corrections for a period of 60 years. >> that was a great feeling, not only to bring the case to an end, but also, again, for the family, you know, to have a -- a good outcome for the family was very important to me. >> for virtually everyone involved, the most difficult aspect of the crime was determining ken otto's motive. >> mr. otto exhibited sadistic behavior with his treatment of animals and he may have been deciding to carry that kind of behavior to a higher level and harm a human being. couldn't understand why he would do what he did. >> we all have unanswered questions. we couldn't even have a proper funeral for her because there was nothing to have. >> it may look like a pile of burned fragments that are completely unrecognizable, but in the hands of a trained forensic anthropologist