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Private moment with his oldest daughter. >> i went out there, and i told her that we did it. she could be proud of everybody. >> reporter: todd's been back many times since. lisa's grave is a special deeply personal place for him. he designed her headstone. what do the figures in it? >> the first thing i would do when i started sketching it is i would draw a heart out. for some reason in my head it should be in the shape a heart. second thing i would put is a mother holding a baby, andleasea and i had -- and lisa and i had this thing we would say. we texted each other and everything, it's from...

>> did he say he loved you? >> yes. >> reporter: but rachel was hedging her bets. she told seth she was also interested in a co-worker named brandon who just happened to call her during her tryst with seth in the park. >> he started getting really jealous. >> so on the 20th when you were communicating with brandon, he said what? >> just give me two more weeks. >> did you ask what he meant? >> yes, he just repeated the same statement. >> reporter: six days later, lisa was murdered in her own bed. >> and here we have a motive that we can understand -- love, the whole relationship with rachel was...

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 ...

Thought happened. >> that's the only thing. that'g >> seth then bolstered the cop's leading theory of the crime so far. that the neighbor, brian tate, had shot lisa. >> who was the first person that came to your mind? >> tate. crasisy -- crazy neighbor who thinks we're terrorists. >> talked about the deer hide and thought tate threw it over the fence so he responded in kind. escalated for several weeks in which tate said dog feces and rocks were thrown

They'd be back to question tate again. what did you think you had? >> we still had a who done it in our minds? >> but lisa's step mom and sister had no doubts whatsoever. >> i thought it was brian tate. >> reporter: but investigators knew they still had to talk to the husband. when they scheduled an official interview with seth that same day, it didn't sit well with amy. >> is this how you always treat grieving husbands and i started crying? i'm thinking they're being so mean to him. >> we got in an argument because i'm like they have to do that. >> seth techel knew the spouse had to be ruled ...