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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...

I take a polygraph test. >> what did you say? >> i said sure. >> kevin, i'm going -- attach. >> so, they strapped him up and ran through the innocuous questions. and then -- >> did you cause the death of nona but dirksmeyer? and then they went out analyzed it, came back and said what? >> the man who gave it to me said that he had not seen anybody fail the test worse in his 28, or some odd years of giving light a tech protests. >> kevin, there's no doubt in my mind that you killed her. >> the murder of the beauty queen was very big news in russellville. and given the nature of the crime and the...