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Been nathan the neighbor saw that day because police found a black hooded sweatshirt on his bedroom floor. what's more, an expert testified it had gun shot residue on the right cuff. >> nathan said that he had been at the gun range. is that feasible that if he was -- >> no. >> shooting off his gun at the gun range. >> what's important about that, too, he said that it was in oklahoma two weeks prior. there is no way there would have been gun shot residue on that sweatshirt still. >> on the stand, another neighbor who did not want to be videotaped, testified she heard a gun shot that day between...

>> well, he said that -- he said that she was overbearing and that he had got to the point where he had wanted to move on with his life and he had met someone else and stuff like that. >> did he tell you the name of that someone else? >> somebody, some student named ana or lana, something like that. >> reporter: but it was what the inmate told prosecutors about the timing of the murder that they found particularly chilling. smith testified that nathan told him he planned the murder specifically for valentine's day. >> it was supposed to be some type of present to this other chick. >> to the --...

Must have been nathan the neighbor saw that day, because police found a black hooded sweatshirt on his bedroom floor. what's more, an expert testified it had gunshot residue on the right cuff. >> nathan said that he had been at the gun range. is that feasible, that if he was a -- >> no. >> reporter: shooting off his gun, that there would be residue? >> what's important about that, too, is he said that it was in oklahoma, two weeks prior. there's no way there would've been gunshot residue on that sweatshirt still. >> reporter: on the stand another neighbor, who did not want to be videotaped, te...

We're looking at a travel time of 7 minutes and 55 seconds. in all, it added up to 9 minutes and 10 seconds of driving. that would have left him just under six minutes to ransack the house and shoot denise. his lawyer, hugh toner, said that would have been nearly impossible. >> the timing just really gets to the point where it's almost not realistic. >> reporter: and what about the state's witness who claimed that nathan had confessed the whole crime to him? the defense argued david smith was a jailhouse snitch, a convicted felon who had gotten a deal for his testimony. he was not even worth c...

Fellow inmate of nathan's at the county jail. he said nathan told him he researched ways to kill denise on his laptop. >> did he talk about how he was planning to kill his wife denise? >> well, at first he told me that he was thinking about some poisoning with some type of insulin or potassium, something like that. >> reporter: according to the inmate, nathan said he ran a lot of errands on the day of the murder to create an alibi. and -- >> he told me he had presented some gifts, some valentine's day gifts to his wife. and so that everything would look fine. >> reporter: how important was dav...