Carl Sessick once worked at a funeral home and he was the one that dumped the bodies in the lake. The ghosts of the people he dumped in the lake were haunting him before he died. He appeared in "Body of Water." In the end, he joined the Watchers. In "Book of Changes", he broke the rules by interfering instead of just warning.  He made someone steal the Book of Changes from the library at Rockland University and made him hide it in Zoe's house. He told Melinda that Aiden can do much more than her.  He also told her that Aiden is an empath and is connected to her.