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And then behind the scenes, you've got love letters being written between rebecca sears and david parsons. >> reporter: notes like these uncovered later by investigators which showed things were getting pretty steamy on hot springs drive. in one david wrote, "rebecca, i hope you like the picture frame. i wish i could had given it to you before i went to p.a. i love you baby. i miss you so much when we aren't together." and in another, "rebecca, i just wanted to let you know that even when you don't think i am thinking about you, i am. i can't wait to see you!" and becky wrote to david, "being ...

They're going on trips together. and then behind the scenes, you've got love letters being written between rebecca sears and david parsons. >> reporter: notes like these uncovered later by investigators which showed things were getting pretty steamy on hot springs drive. in one david wrote, "rebecca, i hope you like the picture frame. i wish i could had given it to you before i went to p.a. i love you baby. i miss you so much when we aren't together." and in another, "rebecca, i just wanted to let you know that even when you don't think i am thinking about you, i am. i can't wait to see you!" ...

Carried on the affair with his wife's close friend and next-door neighbor becky for about six months prior to his wife's death. the revelation of a love triangle would send the investigation into the realm of soap opera. and raise all kinds of new questions. >> you have these next-door neighbors, they're best friends, they're going on trips together. and then behind the scenes, you've got love letters being written between, rebecca sears and david parsons. >> reporter: notes like these. uncovered later by investigators which showed things were getting pretty steamy on hot springs drive. in one...

>> reporter: and who was jerry jaocbs sister? well, becky sears. kay's best friend and neighbor. >> i think my jaw dropped right then. wasn't expecting that. he dropped a bombshell. >> reporter: becky's brother said he knew all about the affair between his sister and david. he told the investigator becky had once confided in him that david was trying to end it. >> she'd come and meet one day or there in the parking lot crying. and i was like, you know, "what's wrong?" and that's whenever she told me she was having the affair. >> he then goes on to say that becky was, had been pretty upset, cry...

>> never once has there been any kind of insinuation, not even 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. >> is it normal for you to call her that early in the morning, call kay, you know, 7:00 in the morning? >> always. 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 thi...