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>> when you've got something that was this bad -- >> somebody's got to pay. >> somebody has got to pay. >> hello, and welcome to "dateline." >> nona dirksmeyer and kevin jones were a couple with a bright future. she was a self-confident 19 -year-old known for her beautiful voice. he was her devoted boyfriend with big ambitions. then, a brutal attack their shattered their dreams. it was a crime that would shake a small southern town to its core. and pit a family against the community they called home. here's keith morrison with "what happened to the beauty queen? " >> look at her. loo...

>> hello, and welcome to "dateline." >> nona dirksmeyer and kevin jones were a couple with a bright future. she was a self-confident 19 -year-old known for her beautiful voice. he was her devoted boyfriend with big ambitions. then, a brutal attack their shattered their dreams. it was a crime that would shake a small southern town to its core. and pit a family against the community they called home. here's keith morrison with "what happened to the beauty queen? " >> look at her. look at the young woman at the heart of our story. you can see how lovely she is. the young beauty queen. c...

Cigarettes but, and they had your dna. on >> the one had my dna? on >> the one that had you dna on. it that's exactly. right you are in the house. and that's what i want to know. about >> how does he react to sort of being cornered, caught in a lie? >> he was getting. scared >> i mean -- i never told you that i wasn't. >> i know, that's my. point >> i'd be over there all the. time that's what i'm. saying >> now, quiz him very was admitting that he had visited his friend aaron. that day but he insisted that he left before anyone was shot. rick says that december and his story were crumbling so ...

Arrested her neighbor, gary done, for her murder. >> i believe we committed this crime, that is my belief, based upon what i saw. >> dunn's trial opened in april, 2010. the state had already tried his son, he hiram johns now argued that dunn was a sexually violent young man, who stalking the beauty queen whose bedroom we could see across the parking lot. his own wife testified he was violent in bed with her, and that weeks before nonna's death, she got him hanging around known as front door in the middle of the night. so said the prosecutor, the jury could be sure that dunn killed nona after e...

Somebody's dna because maybe somebody kicked accidentally -- >> they were wearing dirty latex gloves and passing the piece of evidence between them. isn't that just a classic case of transfer evidence? it's what defense attorneys all the time seize upon. how pristine are you when you do your work. >> it's a classic case. we learned that from the o.j. case. you must change your gloves whenever you touch an item of evidence. you have to put new gloves on. some people will double glove. >> you can't set it down besides something where another piece of evidence was that had dna on. >> it you shoul...