So, before it starts...Who killed him?

With Original Sin dropping tomorrow I thought it'd be interesting to see who the peeps here at Wfigs think killed The Watcher. I've seen some zany predictions at other places, but I thought it'd be interesting to ask here as well.

Personally, I haven't the slightest. With Aaron writing, it serves to reason that he'd pick one of his boys, which, with Wolverine getting ready to die makes him seem like a somewhat logical choice.