we had a new lead. >> the dna from jenni's swimsuit. a brand new piece of evidence. it might lead them to her killer. but when they entered that into the national database, no match. once again, they seemed to be right back where they started. >> you're just in the hurry-up-and-wait mode. you're waiting for your offender to get their dna in the database, because of a conviction or whatever. and that could be a long wait. >> in 2014, gene miller retired. leaving detective wade in charge of the cold-case unit. and she had a new helper. jenni's mom, pattie. 29 years after her daughter's murder. >> my career was winding down. i thought i should probably do something. and so, i volunteered to help. >> pattie wasn't allowed to touch the two girls'murder files, but she could help in other ways.