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He says, i believe my sister had something to do with it. 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, crying because david won t leave kay. he wont leave his wife to be with her. reporter: jacobs then revealed his sister had no intention of giving up on david or letting him stay married to kay. she had asked me if i knew of anyone or if i knew a way that ....
He s like, she just needs kay out of her life bad. you know? stuff like that. reporter: now that was a shocker. investigators had had their eye on becky s other son michael from the get-go. i was surprised to hear it that way. i was surprised to hear that it was michael, really cause, you know, i ve been learning so many things about michael and and his past and all of that. you haven t had any discussions with michael about like you ve had with with christopher? not like with christopher, no. no. cause me and christopher are a little bit closer than me and michael. do you know if she ever talked to michael about it? no, i don t. have a seat right here. reporter: still, edmunds decided it was time to bring in michael for a second round of questioning. and this time, the investigator turned up the heat. michael, it s over, okay? i m not playing games anymore. ....
Time edmunds heard tears coming from his interview room. but to this veteran cop, david s emotions seemed real. and in the end, edmunds had no reason to believe that david played any role in a plot to kill kay. we had no evidence whatsoever to prove that he knew or was involved in any of this. i really don t wanna come have to come back, you know? come back to you with somethin else that comes out that you haven t told me. you know what i m saying? oh, well, you can ask me anything. i don t know what else you need to hear from me. i m not tryin to keep anything from you guys. i promise. reporter: before edmunds turned off his recorder, david did share one tidbit. something that linked up with what becky s brother had told edmunds earlier. it was the name of the other person becky had confided in about her affair with david. becky s son, chris. i asked her who knew. you know, who else knew. and she did tell me that christopher knew that she was with somebody else. ....
He says, i believe my sister had something to do with it. 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, crying because david won t leave kay. he wont leave his wife to be with her. reporter: jacobs then revealed his sister had no intention of giving up on david or letting him stay married to kay. she had asked me if i knew of anyone or if i knew a way that we could do this to kill kay and ....
You know? stuff like that. reporter: now that was a shocker. investigators had had their eye on becky s other son michael from the get-go. i was surprised to hear it that way. i was surprised to hear that it was michael, really cause, you know, i ve been learning so many things about michael and and his past and all of that. you haven t had any discussions with michael about like you ve had with with christopher? not like with christopher, no. no. cause me and christopher are a little bit closer than me and michael. do you know if she ever talked to michael about it? no, i don t. have a seat right here. reporter: still, edmunds decided it was time to bring in michael for a second round of questioning. and this time, the investigator turned up the heat. ....