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Suspect was still out there somewhere on the street at large, potentially targeting his next victim, and it would stay that way unless detectives could prove that the attacks were both the work of travis forbes. there was one possibility and really only one. sitting at the denver police crime lab were several swabs of travis's dna, which detective nash gurule had obtained when the two talked in texas. >> we needed that obviously quickly to compare it to what had been collected from lydia tillman when she was transported to the hospital. >> but she'd been sprayed with bleach and every -- and sh...

Previously, parabon created an image from my dna to show how it works. >> why am i anxious right now? like, i feel like i am the criminal or something? >> [laughs] >> let's see it. >> all right, okay. >> oh, wow. >> i felt like after i got my composite sketch from parabon, but if i had committed a crime and left my dna, i would've been completely busted. >> absolutely, you would have been at the top of the suspect list. >> and now, the lancaster dm is hoping company can help with christie's case. they analyzed the dna left by her killer, trait by trait. hair and eye color, facial structure, ev...

Recalled a name, justin hanson. with that blood they thinked hanson to the crime. he was convicted and sentenced to 18 years in prison. >> going forward the number of cold cases will decrease and also active cases can potentially be solved more quickly. cases won't have to go cold. >> it costs about $3,000, but the results can mean authorities spend less time and manpower to solve a case. dna can't reveal a person's age, so it estimates what a person would look like based on how long ago the crime was committed. >> basically we're predicting where the face falls on different facial dimensions ...

There was one possibility and really only one. sitting at the denver police crime lab were several swabs of travis's dna, which detective nash gurule had obtained when the two talked in texas. >> we needed that obviously quickly to compare it to what had been collected from lydia tillman when she was transported to the hospital. >> but she'd been sprayed with bleach and every -- and she'd been burned. i mean, was there actually any dna left? >> there actually was. it was pretty amazing. it's amazing how resilient dna is. >> reporter: so on a friday evening just four days after lydia's attack t...

Prove that the attacks were both the work of travis forbes. there was one possibility and really only one. sitting at the denver police crime lab were several swabs of travis's dna, which detective nash gurule had obtained when the two talked in texas. >> we needed that obviously quickly to compare it to what had been collected from lydia tillman when she was transported to the hospital. >> but she'd been sprayed with bleach and every -- and she'd been burned. i mean, was there actually any dna left? >> there actually was. it was pretty amazing. it's amazing how resilient dna is. >> reporter: ...