for investigator shull, this was a revelation.ays it's why she stuck with this case for so many years. it's very rare to find a motive in a homicide at all. and in this case, i had a motive. handed to you by the victim. yes. when i listened to that interview, i thought, this is a solvable case. josh mankiewicz: you thought, she laid it out for us. we should finish it. from the grave, we have to find justice. josh mankiewicz: they began to follow the money. it turned out linda was worth a lot of it. she had retirement accounts at southern california edison and almost $700,000 in life insurance. and despite her reluctance to believe that paul was trying to poison her, she had changed those insurance policies, making her sister, pat, not paul the beneficiary. according to prosecutor baytieh, paul only found that out after linda's death. and he wasn't happy. he had letters that he sent to all these insurance companies saying we paid for the premium of these insurance companies from our marriage money, i'm entitled to it. josh mankiewi