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>> i see her laying there, my dad is kneeling. that was the first time i had ever seen him cry. >> they had a tumultuous marriage. they would be yelling and maybe slamming doors. >> according to him he sees lisa with a gunshot wound to the head. so initially its ruled a suicide. her sister went to the missouri state highway patrol to express their belief that this, in fact, was a murder. >> she had been having an affair with her boss. >> the prosecutor says, after he shot his wife, he ...

affair with her boss. >> the pocket cuter says. after he sought his wife, he washed his hands and watched his. >> they call this back at noon. started the trial. >> i thought they made it the worst mistake i headed ever heard of. >> it was obviously there was something that just wasnt right. >> the only thing ive ever wanted was for everyone to hear the truth. i told him that i would find with everything i had and win. thats the promise i made to him. ♪ ♪ ♪ >> hello and welcome t...

going to be through digita evidence the phone records or something like that. >> for melvins family, only partial justice has been served >> i will not give up until we know everybody that wa involved, and what he needs to understand is that its goin to be a lot easier if they com over instead of police havin to find them >> the clock is ticking. >> we are coming >> were coming. and were not giving up. >> im craig melvin. >> im natalie morales >> this is "dateline". >> i see her laying...

>> she had been having an affair with her boss. >> the pocket cuter says. after he sought his wife, he washed his hands and watched his. >> they call this back at noon. started the trial. >> i thought they made it the worst mistake i headed ever heard of. >> it was obviously there was something that just wasnt right. >> the only thing ive ever wanted was for everyone to hear the truth. i told him that i would find with everything i had and win. thats the promise i made to him. >> hello...

Of the moment when the family broke apart? >> thats when a really blew open. thats when lacey quit coming around and everything just fell apart. >> that evening brads brother-in-law paul, who was married to lisas other sister said he met with the highway patrol officers who led the investigation. >> i asked one patrol officer if he had ever been wrong? and there was a small part of me that wish he was correct, because or not he was going to ruin a lot of peoples lives. and he told me straight-up...

>> about a mile from his house and two or three highway patrol officers stopped him and arrested him. took him to the county jail. >> what did you think? >> i thought they made one of the worst mistakes i had ever heard of. >> later we were told there were people around that knew it was going to happen. >> people like lisas sister sean who went to the highway patrol in the first place, and leases daughter from her first marriage, lacey. we asked for interviews, they declined. >> when my dad got ...

Laci and shawn showed up at the house to pick me and dallas up and then my grandma showed up as well to pick us up, and my aunt and my grandma kind of got into it. >> it sounds to me like that is sort of the moment when the family broke apart. >> thats when it really blew open. thats when, you know, laci quit coming around and everything just fell apart. >> that evening brads brother-in-law paul, who was married to lisas other sister, said he met with the highway patrol sergeant who led the inve...

>> got about a mile from his house and two or three highway patrol sergeants and the sheriff stopped him and arrested him and took him to the county jail. >> what did you think? >> i thought they made one of the worst mistakes i had ever heard of. >> later we were told there were people around that knew it was going to happen. >> people like lisas sister shawn, who went to the highway patrol in the first place, and lisas daughter from her first marriage, lacy. we asked for interviews. they decli...