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. you of. for midnight eastern time. one person is in custody. now, stay with msnbc for the latest updates on the breaking news story. now back to dateline. test updates on the breaking news >> welcome back to dateline, i'm craig melvin. karen duenas was brutally murdered leaving her loved ones devastated. adding to their grief's, where investigators suspicion that her husband was involved. mark told detectives he had a secret phone relationship with the former high school crush, and that karen was upset when she found out. now, another surprise was about to jolt the duenas family.

That woman from idaho who decided to conceal her identity, that's the one that he texted but hadn't seen more than three decades. still, the state said that mark killed his wife. >> at some point she said that mark had mentioned that if they were meant to be together something bad would have to happen. >> the woman didn't seem to know what mark meant but the prosecution claimed that he would have to kill current, not just because he wanted to be with her but because he wouldn't have to share his pension with karen, his wife of 33 years. karen must of been angry at mark. and might have told him...

Was convicted. >> mark duenas was sentenced to 25 years to life in prison. and his family? we'll go on believing what they have always believed. that late a night on may 4th, 2012, unknown intruders, probably drug addicts set on theft, burst in, were surprised by karen, killed her and then realizing what they had done, ran away without taking anything. jason no longer lives right next door to the home he grew up in. in fact, the family recently and reluctantly sold the home. the place it happened. the memories, upkeep, too much to bear. >> i mean, it was always in cottonwood, small town. nothi...

Lost a case. not one. her secret, preparation she says. she's very thorough. >> by the time you finish reading through it, your preparation, what did you think? >> i didn't have any doubt that mark was the one that killed his wife. >> one big change in trial number two, the very first words out of the prosecutor mouth were where the states version of that 9-1-1 call, i killed my wife. blood everywhere. no jury she declared could doubt the content of that call. >> and prosecutors offers offered net yet another damning statement from mark himself during his first of three tape recorded interview...

>> yes, both there. >> always there? >> always there. never missed a game. >> his parents. mark and karen duenas, side by side by the dugout, as always. >> they were together since they were, what? 17 years old. >> your parents basically lived in each other's skin. >> exactly. >> his mother had bought the chocolate chip cookies she passed out to the players after every game. and for which she was justly famous. his father had made sure he finished work in time for the opening pitch. what kind of parents where? they >> they were the best parents that you could ask for. >> this is jason their el...