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That lead nowhere. so chavez and his team focused on the crime scene. there was no murder weapon. they did find two spent .45 caliber casings. >> reporter: and near an observation deck just thirty feet away from where mollie and kristene were discovered, police found an empty monster energy drink can and five cigarette butts. >> and the girls didn't smoke? >> the girls did not smoke. >> reporter: chavez sent all that for dna testing. as for the duct tape used to cover the girls' eyes, chavez thought maybe that was itself a clue. >> sometimes that can suggest somebody who knows the victim. didn...

And more things that are lining up. >> for example? >> the use of numbers. >> reporter: remember, kristene said the shooter referred to her and mollie as girl one and girl two. >> did he use numbers in that other crime? >> yes, they referred to each other by number in that particular crime. >> reporter: the similarities between the two crimes didn't end there. in the nevada home invasion was the victim found? >> yes, they were. >> definitely jumped to the top. >> reporter: by that time, dylan stallman had already returned to nevada to begin serving his three-year sentence. so chavez hopped a p...

Are lining up with what we're looking at. >> for example? >> the use of numbers. >> reporter: remember, kristene had said the shooter referred to her and mollie as "girl one" and "girl two." >> he used numbers in that other crime? >> yes. >> they referred to each other by number in that particular crime. >> reporter: the similarities between the two crimes didn't end there. >> in the nevada home invasion, were the victims bound? >> yes, they were. >> he's gotta be number one on the list at this point. >> he -- he definitely jumped to the -- to the top. >> reporter: by that time, dylan spellman...

>> reporter: tips were coming in. someone said they saw a white car speeding from the park the night of the shootings. that lead nowhere. so chavez and his team focused on the crime scene. there was no murder weapon. they did find two spent .45 caliber casings. >> reporter: and near an observation deck just thirty feet away from where mollie and kristene were discovered, police found an empty monster energy drink can and five cigarette butts. >> and the girls didn't smoke? >> the girls did not smoke. >> reporter: chavez sent all that for dna testing. as for the duct tape used to cover the girl...

Dylan spellman was in the corpus christi area, awaiting sentencing for the nevada armed robbery. >> he had been sent here to -- to stay with a friend. >> reporter: what intrigued chavez were some unusual similarities between the nevada crime and the shootings in texas. >> as we started going through that case file, we started seeing more and more things that are lining up with what we're looking at. >> for example? >> the use of numbers. >> reporter: remember, kristene had said the shooter referred to her and mollie as "girl one" and "girl two." >> he used numbers in that other crime? >> yes. ...