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and i was like, "what's going on? " and he's like, "lisa's been shot. " >> i held her hand and i just said, "my lisa. my lisa. " >> everyone's like, "do you want justice? do you want revenge? -- i just want the truth. >> lisa techel, newly married, pregnant, starting the career of her dreams. >> she always put everybody before she put herself. >> then, one morning, a single shotgun blast rocked the newlyweds'home. >> she's been shot. >> a young husband, out of his mind with grief. >> it was a tragedy. but for lisa's dad, a sheriff's deputy, it was no mystery. he was sure he knew who ...

>> 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...

Confidante of seth's. >> i expressed that he needed to either end his marriage or end it with rachel. >> and saying that he should end his marriage with lisa techel, did he make any comment concerning child support? >> he asked me if i wanted to pay his child support. >> reporter: then the witness recalled another remark seth made about lisa. >> he stated that it would be better off if she was in a car wreck and died. >> reporter: prosecutors hoped their third time would be the charm. but the new defense attorneys would come at them with everything they had. and that included explosive new evi...

Seth. >> on 294th you asked him do you really want to be with me, and he respond, "forever." >> right. yes. >> reporter: that's may 24th, two days before lisa's death. and in a followup text, rachel asks second if he told his wife he wanted a divorce yet. >> and he responded, "well, we talked, i told her i wasn't happy. she got mad, then sad, then i slept on the couch. so hello, mrs. resuscitator"? the. >> correct. >> reporter: the firefighter often bragged about his lifesaving cpr heroics. >> he was mr. reus istator and you were going to be mrs. resuscitator? >> yeah. >> reporter: to drive ho...

The state. they just said we forgot to do it. >> reporter: but the centerpiece of the defense case against the cops was something else they didn't do. they'd been so busy investigating seth, who'd been behind bars since his arrest two years before, that they never really paid attention to lisa. the new defense team would change all that starting with her cell phone and the secrets it held. you found out the story told by the phone, that there was some guy, co-worker -- >> right. >> reporter: it was a bombshell. lisa was having an affair with a fellow jailer. her lover was a married man, a fath...