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Assuming, that is, that what she told the detectives was actually true. >> it got to the point where i finally did for her. but it never would have happened without her. >> her. her very own mother joan shannon. she insisted her mom had wanted david dead for months. first by trying to poison him. then later recruiting one of liz's friends to kill him. and finally -- >> she was like, would you be brave enough to do this? >> to do what? >> she wanted me to kill my step dad. >> in 25 years on the job, detective murphy had never heard a story quite like this. he pressed further, he said, pushing e...

>> reporter: they were new to punta gorda. had moved, recently, from scranton, pennsylvania. tara, almost grown up, told them she'd stay behind, make her own life. >> she didn't wanna come down, you know. i'm sure it was, you know, it's change, especially when you're older and -- but we had a bet going on how long it would be before she got here, because we're -- we are so close. so we had a bet going, and i think she lasted three weeks? >> "i'm gonna stay here on my own." "no, i'm not." >> yeah. yes. >> yep, no. >> reporter: she got a job. made plans to start college. had already decided that...

Family feud. >> right. over the land? >> a long time. >> according to humphreys, bambi and diane argued over who should control that property. >> diane wanted to make sure that that property was there for the kids. i think she had become convinced that, you know, bambi was not going to be in a position to manage that property, to manage the assets. >> i love this girl, my daughter, but she's beyond hope, is that the feeling? >> she just can't be trusted with it. >> bambi didn't agree. >> she wanted the property back. >> i have a lot of anger about that. >> but humphreys learned the land wasn't...

Over the land? >> long term. >> according to humphreys, bambi and diane argued over who should control that property. >> diane wanted to make sure that that property was there for the kids. i think she had become convinced that, you know, bambi was not going to be in a position to manage that property, to manage the assets. >> i love this girl, my daughter, but she's beyond hope, is that the feeling? >> she just can't be trusted with it. >> bambi didn't agree. >> she wanted the property back. >> i have a lot of anger about that. >> the humphreys learned the land wasn't the only hot button betw...

Sheffield, ellen snyder's son, mike snyder's stepson. >> he didn't seem to be surprised that the police showed up at his work and he said, sure we have a break room we can talk in. so we went to the break room and conducted an interview there. >> we are going to ask you questions, all right, that we already know the answers to. you knew this day was coming ever since you were 17 years old. how you answer the questions and your honesty here is really going to change your life from this moment on. okay. all right. detective wilson here has been investigating the disappearance of your step father...