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Perhaps there's an innocent explanation. she indeed was, right, his girlfriend at some prior time, not suggesting his dna was, but i think the dna will be very valuable to suggest whether it could be other people who did this. prosecutors believing there is at least two other suspects that were not disclosed to the defense that should have been so that the defense could have made an assessment and cross-examined them as we look at the timeline, jim. >> that was going to be my next question. tell us the role of that, the state's attorney here says those alternative suspects were, quote, not pro...

Investigators eye notorious serial killer Robert Garrow, others in teen Ruth Whitman's unsolved 1959 killing.

Materials that didn't exist before. >> reporter: genetic genealogist thinks the case could be solved under hours if the boulder police would allow labs like hers to have access to the dna in the case. it could track down a family member of a suspect and that could leading investigators to her killer. >> we've been doing this the last four years. we've been able to help solve, on average, one crime per week using this technology. >> reporter: jonbenet's family says they hope keeping the pressure on will bring them the same results. >> we're not going to let this case up in a dusty file cabinet ...

Agency outside the boulder police department. >> the latest technology exists and those really cutting-edge laboratories that are using state-of-the-art techniques to analyze dna samples. that's where this needs to go. >> reporter: if government officials do not respond after the petition is submitted, ramsey says he will absolutely seek legal action. investigative genetic genealogy could be the answer to finally solve this decades-old case that haunted the family of jonbenet ramsey who was only 6 years old when found murdered inside her family's boulder, colorado home the day after christmas ...

John bennet ramsey murdered. laura ingall has an exclusive interview with her father about his hope of finding his daughter's killer but eyeing advances in dna technology. >> reporter: shannon, the case of jonbenet ramsey is one of the most high profile murder mysterys and pushing officials to come together and use cutting-edge dna technology to find answers in this case. >> there's evidence that's never been tested for dna, never been sampled for dna. and the latest technology to be deployed. >> reporter: the frustration of searching for his daughter's killer is still painful for john ramsey ...