Mark Uncaring News Today

but as shock set in, leads poured in. witnesses reported strangers lurking. a car speeding through the neighborhood. and there were footprints out behind the house. >> putting alarms on every door because somebody is out there. >> but detectives, they decided the killer wasnt out there, but inside the house. now, with one of their own under arrest, the family was furious. >> you see these people, this is love. this is belief. this is human being. please listen to us. >> then investigat...

From as long as i could remember. >> but if that was true, then why would detectives be so suspicious of the man married to his high school sweetheart for almost 33 years. a man without so much as a traffic ticket on his record, let alone a violent act? well, its true that when wives are murdered, husbands are frequently implicated. and mark did discover the body. but there was another reason -- just minutes after mark sat down to talk to those detectives, he volunteered information that sounded...

The shirt. there was blood all across the waist band, down the sides, different spots throughout the shorts. even blood on the inside of the boxer shorts. >> which you dont think you couldve gotten he couldve gone there by touching his hands, arent moving, changing, adjusting? >> absolutely not. not in all those locations. >> the prosecutor claimed mark must-have washed off some, but not all of the blood. after the stabbing. like a shower in his close or something. then she claims, she found the...

Hours and days after karen duenas was murdered. >> the best way i can explain my mom is, she was pure of heart, is the best way to say. >> the whole big family, karen s family as well as marks. parents, brothers, sisters, gather to support each other and more on. and struggle with the question that hugged in the air -- who did this? word on the street was there was no question at all. >> we immediately heard rumors, outlandish rumors. i dont know where youre getting this? >> the boys heard them....

Some teenager two or three blocks away, who said they heard a screen between 10 and 11 pm. the pathologists testified that karen could have been killed as early as 10:30. or as late as 2:30, am. the state said that it must of been 10:30. after which, mark must of washed his clothes, slash the screen to make it look like an intruder came in, then went to bed. and waited for sun, casey, to come home from the movies. >> one of the theories that we did have is that he wanted casey to find karen. >> ...

. 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, im craig melvin. karen duenas was brutally murdered leaving her loved ones devastated. adding to their griefs, 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 wa...

That woman from idaho who decided to conceal her identity, thats the one that he texted but hadnt 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 didnt 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 wouldnt have to share his pen...

Was convicted. >> mark duenas was sentenced to 25 years to life in prison. and his family? well 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...

Lost a case. not one. her secret, preparation she says. shes very thorough. >> by the time you finish reading through it, your preparation, what did you think? >> i didnt 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...

>> 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 others 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 ...