Board Thread:Character Discussion/@comment-6175354-20161010033114/@comment-1916997-20161010143614

Also, the way they are setting this up is that David is going to want to avenge his father's death. That alone implies it will need to be at the very least a recurring character who is still alive, so that we really see David struggle with what he is going to do. And as Jenna pointed out, the writers have teased surprises about David's past, surprises about Hook's past, and David and Hook bonding. Couple that with the fact that we know Hook randomly killed people (remember the ring discussion in 5A), and I don't see how the killer can be anyone other than Hook. But we will find out soon enough, I'm sure.