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Your mossberg in that rack? >> yes, it's the middle one. >> lucas talked to deputies about the gun on the day of the murder. >> i told'em that i hadn't took it with me and it should be there. >> but his 12-gauge wasn't there when crime scene techs scoured the trailer. and cops knew another place it wasn't -- on the list of guns kept at the house that seth had written out for the dci agent. investigators felt certain the mossberg was used to kill lisa, but a big question remained. >> where is it? that's what we wanna know. where is the gun? >> that same sunday morning, a team began searching th...

Deputy marty wonderman working his first-ever homicide case was back at the search. over here by this tree, what do you center. >> "we've got it, shotgun here," they were going nuts. >> there of the mosberg in the tall grass about 20 yards from the back door of the trailer. that was a huge development in the case. >> it was. i think everyone's mood doubled or tripled when they found the gun. >> ballistics would match it with the slug that killed the pregnant lisa. investigators could fill in one big box on their checklist -- murder weapon. next they worked on possible motives. was it a neighbo...

>> you're in nurse mode? >> i'm thinking maybe if i get here fast enough, there will be something i can do. >> todd raced behind in a separate vehicle. >> i repeated over and over, oh, my god, oh, my god. frrt that's all i could think and say. >> at the scene, deputy ran back to the house and did what he could to help the emt. >> started giving lisa cpr. it felt like forever. and i'm asking him you want me to do cpr still? and he told me not to. >> there was nothing more to do. she was gone along with her unborn daughter. lisa marie was just 23 years old. >> i ran in there and you could tell s...

Him. >> reporter: and they sawcentri. certainly not a killer. at last it was time for the state's star witness, rachel mcfarland, the other woman, to show up and tell her story. did you need the jury to like her? >> we needed the jury to believe her. >> reporter: rachel testified her relationship with seth started heating up in december, 2011, which was two months after seth got married. >> it became more sexual, asking me to send pictures or -- i don't know, just showing off my body i guess. >> reporter: on may 20th, 2012, seth and rachel met at a nature preserve where they took this selfie t...

Tw of them were going to get married, jeff and lisa made the inevitable official. >> seth came to our house and met with us and asked our permission to marry lisa. >> old school? >> old school. >> after dating for years, they got married in october 2011. she was 22, he was 21. >> i told him no matter what he did to take care of her and protect her. >> and he said. >> he said he would. >> she got more than a brother in law in seth. >> he was my friend. >> he called me dad. we told each other we loved each other. i felt as close to him as i did my vun. >> for lisa, it was having all his buddies ...