The actor, who plays serial killer Dexter Morgan on the Showtime drama, said that while he is still unsure how the series will end, he cannot imagine a positive outcome.
"I don't know about a happy ending. I think the question is what happens to him," Hall explained in a new interview with Parade.
"Is he done in? Does he do himself in? Does he get away with it? But even if he gets away with it at this point, there have been a lot of ramifications for his behaviour already. What the final verdict will be for him specifically, I can't say. As for a happy ending, I don't think we're in that territory."
However, Hall was quick to add that he believes Dexter has developed immensely over the course of the series and has still retained much of his humanity despite the gruesome acts he commits.
"I think we're meant to be skeptical about Dexter's claims of inhumanity when we first meet him. At this point, especially given Dexter's seemingly authentic connection to his role as a father and to his son," he said.
"I think it's difficult to argue that he's without the capacity of human emotion. But his ability to compartmentalize has probably developed as much as anything."
> Dexter renewed for two more seasons by Showtime