bad things that they had to say about him. i knew my dad was never capable of doing something like that. you know, i was going to have his back regardless. reporter: but to investigators, scott s affair and the fact he lied about it to police certainly was suspicious. ellis and boyd asked the girlfriend to help them out by recording her conversations with scott. maybe he d let something slip. hey. hey. are you oka yes, i m okay. they just left. look, all i want to know, did you do it? of course not. they told me i would be number one prime suspect because i m the husband. do you still love me? yes, i do. if you did have anything to do with her dying, was it because you love me. i didn t have nothing to do with it. no. no. i had nothing. my hands are as clean as they
long. especially in a little place like moundville. and it didn t take very long for sheriff ellis and corporal boyd to stumble on the secret scott had been keeping. while we was out at the crime scene, scott had had a young lady pick up the boys. reporter: it was only later when the fog of grief had lifted that one of teresa s relatives wondered to police, who was that woman hanging around the day teresa died. ellis and boyd tracked her down and what they discovered, well, that changed everything. or seemed to. the person they were talking to was scott s mistress. she was under the impression that scott was not married at that time. reporter: what did you make of that when you heard that? we knew that wasn t correct. reporter: a love triangle, jealous home wrecker kills wife, claims husband? no, not even close. scott s girlfriend thought his
she was kind of in a jam herseland she wanted us to try to help her. you know, we can put a word in to the d.a. and to the jury. reporter: that was enough to get cooperation from her? right. reporter: the objective was simple, get dawn talking, wran gel from her something that at least sounded like a confession. ellis and boyd fitted the cell mate with a digital recorder no bigger than a matchbox. and on a friday afternoon, as an unsuspecting dawn was looking over her case file, her cellmate walked in looking for an incriminating tid bit. what she got instead was the whole sickening story. here s what dawn told her cellmate about the morning teresa was killed. around 7:00 a.m., dawn called teresa with a lie to set the plan in motion. no more vacation days. i told her my car was dead. reporter: she claimed her car