Except that Will regurgitated her ear, and the Chesapeake Ripper cleared Will of all wrongdoing, according to tonight's episode. So the clear assumption on the part of law enforcement must be that the Chesapeake Ripper framed Will for her disappearance and the other copycat killings.

What bothers me is that Chilton was in a hospital being put back together when Abigail disappeared. So how could he be the Chesapeake Ripper (in theory)?