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David now suspected those texts came from becky. >> did it ever -- ever run across your mind at that time that maybe the text messages were comin' in because your time table and becky's time table weren't the same? >> it crossed my mind. she was trying to let kay know 'cause she thought that if she found out, that kay would leave. >> reporter: david's interview went on into the night. >> we get up and briefly walk out of the interview. and he's still in there, still being recorded and then he starts talking to himself, you know, about "what have i done?" >> oh, man. they're going to blame me. ...

Insinuating that i would ever want anything to happen to her. >> reporter: as for those repeated calls from california the morning of the murder, david insisted he was genuinely concerned about kay. i always call her 'cause i, like, talked to derek before he went to school. i started gettin' worried. i thought maybe she was in an accident or somethin' out on columbia road or somethin'. >> reporter: edmunds started thinking david was telling the truth. so he changed course and asked david whether he thought becky had it in her to mastermind kay's murder. >> deep down inside, do you think she co...

>> she was trying to let kay know cause she thought that if she found out that kay would leave. >> reporter: david's interview went on into the night. >> we get up and briefly walk out of the interview. and he's still there, still being recorded and then he starts talking to himself, you know, about "what have i done?" >> oh, man. they're going to blame me. this cannot be real. >> reporter: but david's interview wasn't over yet. he had more to share including a clue that would bring edmunds and his team of investigators one step closer to the truth. >> investigators learn more about another ma...

>> to hurt my wife? kill my wife? to have my wife killed? i'm not i do not believe that. >> reporter: edmunds kept pushing. eventually david revealed that more than once he'd wondered just how desperate a housewife becky had become. he told edmunds a month before kay's murder, someone sent bizarre texts to her that hinted of the affair. david now suspected those texts came from becky. >> did it ever -- ever run across your mind at that time that maybe the text messages were comin' in because your time table and becky's time table weren't the same? >> it crossed mind. >> she was trying to let k...

This cannot be real. >> reporter: but david's interview wasn't over yet. he had more to share including a clue that would brg edmunds and his team of investigators one step closer to the truth. >> investigators learn more about another man in becky's life. >> it was a real, real strange mother/son relationship. when his mother called, he would drop everything and go to mom. whatever she wanted, he was there. happy thanks for giving! thanks for giving lien the strength to outrun her brother. thanks for giving victor the energy to be the rowdiest fan. and joseph, the ability to see monsters. whe...