cricket wireless. >> reporter: lisa techel was dead, murdered in her own bed. her distraught husband seth was outside, shirtless and barefoot. when lisa's little sister >> your best friend. >> yup. >> reporter: seth was inconsolable, and acting out. >> i went over to him when i first got there and i tried hugging him. he pushed me away. he punched his truck, and i said, "don't do that, seth, you know, let me see your hand." >> reporter: todd offered to take seth back to his house, but doug techel knew this was a moment his son should be with him. >> it was just bad. and we just hugged and cried. >> reporter: marty wonderlin, working his first homicide, was the first deputy to speak to seth. how'd that go? >> you know, i ask him what happened. >> i came running out. and i looked in the bedroom and she's laying there. >> reporter: through the overwrought husband's sobbing, a story started to emerge. >> he basically tells me that he was in the shower gettin' ready to go to work, and he hears a gun go off. >> i ripped open the -- shower curtain and i grabbed my towe

tinnes at some point did your relationship with lisa techel become sexual? >> now when we talk about a sexual relationship we're not talking about texting, are we? >> no, sir. >> we're talking about actual sexual intercourse correct? >> yes, sir. >> reporter: for lisa's father, the revelation that his daughter had a lover was the cruelest blow yet. >> the first emotion i had is, "why? why, lisa?" you know? and my second thought is, "i don't wanna tell amy 'cause i know she's not gonna be happy." >> reporter: does it taint your memory at all? >> really, what it did for me more than anything is, i have so many more questions that i'll never get the chance to ask her. i mean, i love lisa and she was a human being and she made mistakes. >> reporter: the graphic testimony about lisa's affair, and how police overlooked it, fit perfectly with the defense's theme of a botched investigation and a rush to judgment against seth. >> here's a legitimate suspect that should have been investigated. >> reporter: investigators never spoke to jason while they were building th

mething to smile about. >> reporte >> reporter: lisa techel was dead, murdered ir own bed. her dira husband seth was when lisa'little sisr yr your best frien >> y. >>eporter: seth was inconsolable, and actiut. >> i wenov to him when i first got there and i trd hugginhim. phed me away. he punched he punched his tck, d i said, "d't do at, seth, you knowt me see youhand." >>orter: todd red to ta sh bao his use, b do techel knew this waa moment his son should be with >> it was bad. i mean, wobbing. d we jt gged and cried. >> reporter: mty won, first homicide, was the first deputy to speato seth. w'd that go? you know, i a himha haen. >> i camruing t. and i looked in the bedroom d >> reporter: through the overwrought husband's sobbing, a ory stard to emerge. he basiy tes me thahe was in t shower gettin' ready to go to wk, and he heara gun goff. >> i ripped open the -- shower curtaiand i grabbed my towel and i cameut. i didn't i didn't see anybody down the llwa m gonna kill whoever the -- did th. >> reporter: there's been some sort of an intder. >> yeah, that's whate's tell' me,