>> we were close by in case something happened. >> sheila did come over. the police didn't record anything to pin sheila to the crime. she tweeted this picture of herself and an uncomfortable looking rachel with the caption, finally got to see rach. police didn't record anything to pin sheila to the crime. >> the girls did not disclose anything specific. they were just very casual. >> a few days later, the police went to sheila's house with a warrant. >> we seized every kitchen knife we could find. the fbi seized sheila's car and they were able to find presence of dna in the trunk. >> dna in sheila's trunk. if it proved to be skylar's, it would be critical to gaskins' case. a direct link. connecting the girls to skylar's death. they shipped the sample off to the lab and waited. meanwhile, gaskins got a positive i.d. on the human remains found out past blacksville. it was skylar.