way. two months after kevin's acquittal, and more than a year after nona's death, steffy police chief told him to question a suspect and recent burglary. a man by the name of gary dunn. steffy's eyes widened at that. >> my chief said 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.