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Police say Mark Twitchell was fascinated by the Showtime series "Dexter." Newly revealed letters offer a rare look at the killer's thoughts.

Mark twitchellSteve lillebuenTroy robertsJohnny altingerJulia cowleyDexter morganJohnny cowleySteve lillebuen twitchellMacewan university professor steve lillebuenEdmonton journalParamount globalDexter killerUntold story behind mark twitchell