On Showtime's Dexter, Michael C. Hall plays a Miami forensics detective who spends his days examining blood splatter, and his nights out on killing sprees.

It's not as cold-hearted as it sounds though — Hall's character strictly adheres to the "rules" he learned from his foster father; he only kills people who "deserved to die."

Hall discusses the challenges of playing the ultimate good/bad guy — the role of the likable serial killer.

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