I hope no one minds me reviving this old thread, but I'm late to the party with the Serial phenomenon. I finished up all the episodes right after New Year's and just saw a story yesterday that Asia McClain is stepping up and providing an affidavit for the motions Adnan's new counsel is submitting, in hopes of getting a re-trial I guess. My personal opinion is that Jay and Adnan were both involved, but Jay did the actual killing. One theory I read which sounded most plausible to me was that Adnan wanted Hae killed (for various reasons) and went to Jay to get it done because Jay was the "troubled" kid of the school. The one most likely to do something like that. This explains how Jay knew so much, and also explains why Adnan would confide in Jay even though they were merely acquantainces. It also explains why Jay would so easily turn on Adnan.