I'm not an expert on either possible perp or the details, but I *think* it's considered likely that Samantha Clarke was a victim of Randy Allen Taylor. He is jailed for murdering another teenage girl (Alexis Murphy) and he had been in contact with Samantha Clarke just before she disappeared. I know that's not 100% proof, and RAT has never confessed, but it seems unlikely that she was in in contact with two different serial killers in the space of 24 hours. Astronomically unlucky if so.
Edit: Although, and someone forgive me if this has already been pointed out...didn't RAT's original alibi about Alexis Murphy claim that there had been a mystery guy with dreadlocks involved? Well, now my head hurts.
EDIT 2: Nevermind, read this post:
http://www.websleuths.com/forums/sh...xis-Murphy-1-May-2014&p=11007729#post11007729