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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 wasn't 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 investigators rush to judgment. >> do you have any idea, beyond your own fevered imaginations that happened? ...

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, it's 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 to them like a motive for murder. >> what was going on in our life -- and it scares me when i thin...

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 don't think you could've gotten he could've gone there by touching his hands, aren't 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 murder weapon. or what could be the murder weapon. a knife found in the wrong slot in the kitch...

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 don't know where you're getting this? >> the boys heard them. to rumors the detective knew who the killer was, mark. to which the family said -- >> it's ridic...

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. >> and he sleeping peacefully, is that the idea? >> correct. >> and to cover his tracks? >> correct. >>...