where you couldn't get there fast enough. >> rachel shoaf had just confessed to teaming up with sheila eddy kill their friend skylar neese. now she was cooperating with police. gaskins and his fellow investigators hatched a plan. rachel would invite sheila to her house. as hidden cameras rolled, she would try to get sheila to inkraim nate herself. >> we were closeby in case something happened. >> sheila came over. she tweeted this picture of herself and an uncomfortably looking rachel with the caption, finally got to see rach. >> 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. 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. >> the search for skylar neese