a man by the name of gary dunn.aid do you know who he is? he said yes. he was one of the neighbors to nona dirksmeyer. >> gary dunn, a neighbor of known as. he was among that handful of men who had been questioning and cleared by police. steffy new that done certainly would've had the opportunity to kill. his bedroom window look to actually across the small parking lot unknown's bedroom window. now he had to get that man's dna. >> how do you do that? >> i asked him for. >> and he said? yes >> basically. i asked him if he'd be willing to give me his fingerprints. and i said, if i can roll them out, they are done. >> but there was a problem. to get that sample tested, he needed to get the cash strapped jones family to pay for it. i first kevin's mother hesitated, the test costing about $600. but the investigator insisted. what did she say? >> eventually she said something like, oh, shucks, it's just money. >> so she paid for it. and what a good investment it turned out to be. because because weeks later, steffy got a