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And now detectives had two ex-husbands to investigate. ron beigler, the last person known to have seen her alive, and rob dixon, the man she told friends she lived in fear of. >> most people that she knew, friends, believed that rob dixon had something to do with this. >> so he pops right up to the top of your list? >> absolutely. he and rob beigler, both. >> reporter: as for hard evidence, there was very little. except for the investigators' little secret, the one bit of evidence they'd been hiding from everyone, even the birgfelds, something that by pure luck survived that car fire. paige's ...

I'm so blessed to have you in my life. >> she tried to minimize the relationship. >> nathan and aina were making eye contact quite a bit throughout the trial. sometimes when she would answer a question or she said something he didn't like he laughed and threw his hands up in the air in disappointment. >> reporter: and prosecutors had another piece of evidence they say proved an affair, a secret that shook the courtroom. it challenged the very core of nathan's defense that denise was at the center of his life and he would never hurt her. it was a gut wrenching note written by denise discovered ...

>> reporter: listen to it again. >> this is my son's friend. >> reporter: "this is my son's friend." one phrase in hours of material but it got dove's mind racing. if the bartender was right that the killers were friend of sandra's son, could that slip of paper hold the key to the case? dove tore through bags of evidence, and there it was. the day planner. seized five years earlier just after the murder. >> i went through that day planner for probably a day or more. went through every scratch, piece of paper, every notation, everything that was put into place in that day planner was looked at....

>> what we ended up having to do was literally follow brett schrauben around until we saw him on his telephone. we later took that even further in that i went into the target store that he was working at one day. i noticed he was stocking shelves in a certain section of the store so i started randomly picking up items and looking like i was interested. at that point i called on my cellular phone to one of my other investigators outside and said, put a call in now to the phone. i heard him answer the phone. so i was able to say that is his phone, he talks on it. we've put the phone in his hand....

And a sea-doo. but on the question of who was behind the plot, that's when the story named names, two of them. they were sandra's son, tom, the mama's boy jack raised as his own. under the direction of the mastermind herself, jack's wife, sandra. so with that new perspective on the case, dove revisited sandra's old interview. the hours of mostly useless chatter. >> how many times did you listen to that interview? >> at least ten times. >> reporter: and then it jumped out at him. right about here on the tape. sandra is going through slips of paper in her day planner. she looks at one and says -...