he was one of the neighbors to nona dirksmeyer. >> gary dunn, a neighbor of nona's. he was among that handful of men who'd been questioned, then 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. >> but there was a problem. to get that sample tested steffy needed the cash-strapped jones family to pay for it. at first kevin's mother hesitated. the test 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. >> so she paid for it. and what a good investment it turned out to be. because weekends later steffy got a call from one of kevin's lawyers. the dna tests were back. and wouldn't you know. >> i said it