but i just couldn't believe it. >> robert washburn. murder. he was never a suspect. on her short list, only because of that genealogy analysis. why did washburn's name end up on the list to be tested for dna? >> because of his last name. >> just the last name? >> yes. >> because he was in that list that was sent to you? >> correct. >> at the time, it seemed like a coincidence. a fluke. but now, here it was. no doubt. robert washburn's dna on jenni bastian's swimsuit. it was head spinning. zblfr and the funny thing is he was not a high-priority suspect. >> he certainly hadn't abouted like one. they learned in the years after the murder/rape of jenni bastian, robert washburn blended into middle america. literally. stayed out of trouble. in fact, when investigators came knocking at his door? he voluntarily gave them a dna sample. >> now, more than three decade after that terrible day in the park. washburn was arrested, at home. and then, the new cold-case detective spoke with him. how did he react? >> he was scared. he was very nervous. h