he was one of the neighbors to nona dirksmeyer. on (voiceover): gary dunn, a neighbor of nona's. he was among that handful of men who'd been questioned and cleared by police. steffy knew that dunn certainly would have had the opportunity to kill. his bedroom window looked directly across a small parking lot at nona's bedroom window. now steffy had to get that man's dna. how'd you do that? i asked him for it. and he said yes? basically. i just asked him if he would be willing to give me his fingerprints and a dna sample. if i can rule them out, then we're done. keith morrison (voiceover): but there was a problem. to get that sample tested, steffy he needed the cash-strapped jones family to pay for it. at first, kevin's mother hesitated. the tests would cost about $600. but the investigator insisted. what did she say? eventually she just kind of said something like, oh, shucks, it's just money. keith morrison (voiceover): so she paid for it, and what a good investment that turned out to be because weeks later, steffy got a call from o

himself in handcuffs again after two incidents that occurred on the same night both unrelated to nona dirksmeyer. dunn pleaded no contest to attempted kidnapping and indecent exposure. he was sentenced to 15 years. barring new evidence, the state does not plan to file charges against him for a third time in the nona dirksmeyer killing. that's all for this edition of "dateline." i'm craig melvin. thank you for watching. hello, i'm craig melvin, and this is "dateline." hello, i'm craig melvin, and this is "dateline."ens . it doesn't happen to your family, to your brother. but it does. craig (voiceover): no one thought it could happen to him. he was a tough guy prepared for anything. darla: he always would say, if anyone tries to break in here, i'll kill him. craig (voiceover): instead, he was killed, stabbed in his own home. dispatcher (on phone): you're sure your dad's cold to the touch? craig (voiceover): his son and daughter-in-law stumbled into a terrifying scene. that's when i saw the gun. roger: they said we're going to have to kill you now. craig (voiceover): a strange story that only got s