Does he die? Why? How? Is he the FBI mole?!
Post your crazy, not-so-crazy and totally improbable theories here. Or even some realistic ones.
Here's my crazy, but could totally happen, theory:
Me, I'm a strong believer that you can't change the future. For some reason that I have yet to come up with, Demetri's death must be faked. That DD chick told the person on the phone to talk to agent Noh a month after he supposedly died. On April 29th, at around 9:57pm, Dem realizes that, in order to prevent his 'past self' from having a vision and revealing that he is, in fact, alive and ruining the whole plan, (What? He's not dead. He said his flashforward showed him skiny dipping in the Bahamas a month from now!) he needs to be unconscious and promptly knocks himself out.
Theory buster: DD chick probably has no idea Dem is dead. And as far as I can tell, faking Dem's death seems like a stupid, pointless idea.
and now, share yours.