But in eight hours of videotaped sworn testimony given by Brad Cooper, 34, earlier this month for use in the custody hearing over the couple's two daughters, clips of which were viewed by ABCNews.com, he asserted his desire to assist the investigation into his wife's murder.
"My primary focus [in the months since Nancy's murder] has been trying to get to see my girls again and helping in the investigation about Nancy," he says.
"I have answered every question [the police] have," Cooper says on the tape. Cops have visited his home at least five times since his wife's death, he said.
Jennifer Ball, Brad Cooper's former fiance, expressed doubts about him, according to an affidavit filed Oct. 13 in which she says he "constantly belittled" her and was "emotionally detached" and "mentally cruel."
Similar allegations of belittlement were made by Nancy Cooper's parents in a custody petition filed in July, according to court documents.
Brad Cooper "engaged in a pattern of emotional abuse," frequently yelled at Nancy Cooper and belittled her in the presence of the children, according to the petition.
In her affidavit Ball also said that when her relationship with Brad Cooper ended in December 1998, she "became fearful for her physical safety."
Brad Cooper's videotaped testimony -- the first time in more than three months that he has spoken on the record about his wife's murder -- gives details about where he was the morning of his wife's death. He also continues to maintain his innocence.
According to his testimony, Nancy Cooper went jogging at around 7 a.m. and when she hadn't returned almost two hours later he assumed that she was "punishing him" for not cleaning.
"I thought maybe she had been punishing me by not coming back because the floors weren't clean and weren't washed," he says.
"I washed the floors with hot water and vinegar," he says in the testimony. "I was trying to make her happy as best I could."
Asked by investigators whether he had ever visited the area where his wife's body was found, Brad Cooper said that he had not, adding that he didn't think she would run in that area.