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Door. >> as if somebody was about to steal them? >> yes. given the indication that this was a burglary gone wrong. >> there was no sign of the murder weapon, but detectives did recover two .38 caliber slugs and there was something else that caught detectives attention. >> on the inside of sherry's left arm they found a bite mark. a crime scene analyst at the time went ahead and swabbed for any possible saliva that could belong to her. >> saliva that could contain dna for whoever bit sherry. this was 1986. years before dna testing technology would arrive. so back then the dna wasn't much help. ...

Assaults in central minnesota dating back to the 1980s, we consider him to be a person of interest. >> officers reexamining evidence with new dna testing technology. heinrich's dn washington was wound on an assault victim nine months before jay kohn cob -- jacob's abduction. rod miller is a former d.c. homicide detective. this case really put -- he was the natural post buy for abducted children. happened to be in my home state of minnesota. it's been so long, and now this guy may have something to do with it. what do you think? >> i think that this cold case is no longer as cold as it used to ...

John ramsey. let he read you that statement, saying public release of the allegations of an unmr.ed indictment only serves to further defame him and his late wife. as you mentions, dna evidence cleared any involvement in this murder as far as the physical act of committing the crime, cleared the family of that. and that came out long after the grand jury indictment. again, that dna testing technology cleared them later in 2006. and the d.a. at the time sent the letter to the family saying they're no longer being looked at under this cloud of suspicious. >> but i think the ultimate question is,...

Person is. who is that person they're referring to? >> reporter: and again that -- well, that's the big question. that's the murder mystery that continues to hold true today. they have dna of the person they believe committed the murder. the dna that was found on her clothing, on several items of her clothing, that they know belongs to a male. and it's somebody unrelated to the family. so as a result of that dna evidence, the district attorney several years after the grand jury indictment happened, she cleared the family from any involvement in the murder. and she even sent a letter to john ra...