he said robert washburn. >> no way. >> i knew who it was but i could not believe it. >> robert washburnp about michelle's murder, he was never a suspect. on the short list only because of the genealogy analysis. >> because of his last name. >> because he was in the list that was sent to you. >> correct. >> at the time it seemed like a fluke but now here it was, robert washburn's dna on jenny's swimsuit. it was head spinning. >> the funny thing is he was not a high priority suspect. >> they learned in the years after the murder and assault of jenny, robert washburn blinded into middle america. he moved to illinois, got a job, paid taxes and stayed out of trouble. when investigators came knocking at his door he voluntarily gave them a dna sample. now more than three decades after that terrible day in the park, washburn was arrested at home and then then new detective spoke with him. >> how did he react? >> he was scared, he was nervous and sweating, he asked me if it was about the swap he gave the fbi a year ago and then he told me i did not kill that little girl. >> with washburn in hand