John Lithgow kills for ‘Dexter’

Actor joins cast of Showtime drama

John Lithgow has joined the cast of Showtime’s “Dexter” for its fourth season.

Thesp will play an unassuming suburbanite who has been living a double life for decades as a prolific serial murderer known as the “Trinity Killer” for his penchant for committing his homicides in batches of three.

Lithgow’s character will become a source of fascination for the series’ title character, a blood splatter expert who moonlights as a serial killer of criminals who manage to escape the law.

Showtime said Lithgow will appear in all 12 segs of “Dexter’s” upcoming season, which bows Sept. 27.

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