with brad struck detective daniels as odd. when he asked brad, did you contact nancy s family? he had told us no. but it could be because he s frantic about the situation and wouldn t have time to call them. reporter: a little more talking and the detective learned there may have been another reason altogether. nancy and brad were having marital problems. he told me the last two months they seemed like they were getting better. when i asked him why they had problems. he told me he had had an affair. reporter: so daniels tucked that tidbit away and went on for the search for nancy. but after her body was found, things were different. the cooper house became a crime scene. police in and out, turning the place upside down, and daniels kept his ears open. because among nancy s friends and family, people were certainly talking. we re getting all this information and we re having to separate what s important versus what s just part of a marriage. reporter: brad remember told dete
her life. reporter: wait a minute. nancy s allowance, remember, was $300 a week. would a jury think that was evidence of abuse? how do you tell a jury that he s depriving her. it s difficult. the facts still remain there are these signs of control emanating from that cooper household. it doesn t matter whether it s $1,000 a week or $10 a week. the fact of the matter is, is that it caused friction between the two of them. reporter: and so the jury heard about that last week of nancy s life, the week of war with brad. with nancy s father on the stand, prosecutors played a phone message nancy left her parents after she returned home from that vacation with her family. the house was so dirty. there were ants infesting on the table when i got there. as that last week went on, the fighting escalated. on friday, her friend testified,
but there was no physical now missing router. they claim that he checked out a evidence linking brad to the generate a phone call. crime. not did he have the the prosecutor would say it was technological skill. they also took photographs of because he cleaned the house. the house. he covered his tracks well. but there it was. they searched the house. and they have not once what was the best evidence introduced any evidence that the against brad? router was in the house. ironic, perhaps, given the reporter: hard drives don t defendant s particular lie. or do they? expertise. we knew we had this that was the question the fabricated alibi we needed to defense raised when it came to those apparently damming results address. reporter: the issue was the of the fbi s search of brad s computer. phone call the morning nancy disappeared. you re talking about a brad s cell phone registered a computer that we know was call from home at 6:40 a.m. when tampered with. you re alleging wh
during a murder investigation put the children at risk. in late july the girls went back to canada to live with krista, their slain mother s twin and her husband. brad had not been charged with any crime. wasn t even a declared suspect and he fought hard to get his daughters back. afterwards, i thought about it. reporter: which meant three months after nancy s murder sitting for a videotaped deposition, in which brad answered questions under oath about his marriage, his affair and what happened the morning nancy disappeared. so, were police investigators listening? oh, yes, they were. was nancy a good wife? i would say so, yeah. she was supportive of myself and of the children. very loving and generous. reporter: but there were two issues. the trouble with cooper s marriage, one was money. the couple had serious debts. this past week i looked at the american express card from january 2007 to december 2007. of that, $27,000 was accredited to nancy s credit card. and mine was
took place in her home, the residence of nancy and myself. in the closet of the master bedroom. reporter: when dateline continues. fragrance shouldn t either. air wick s new technology releases fragrance upwards and outwards unlike febreze. so now you can fill every corner with fragrance. upgrade to air wick. whoa. travis in it made it. it s amazing. oh is that travis s app? it s pretty cool, isn t it? there s two of them. they re multiplying. no, guys, its me. see, i m real. i m real! he thinks he s real. geico. over 75 years of savings and service.