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John Lithgow Sheds Lights on Arthur Mitchell, Dexter Season Finale

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Attention all other supporting actors in a drama: don't bother submitting your name for the Emmy Awards next year. John Lithgow has the category locked up.

The actor has mesmerized and frightened Dexter viewers throughout season four, culminating in the closing scene of this week's episode, where Arthur confronted Dexter at work and confirmed the latter's worst fears:

The Trinity Killer knows his identity.

Lithgow spoke with CBS' Harry Smith this week, explaining how he got the role on Dexter and offering up the tiniest clue about Sunday's season finale. (Warning: the video begins with a clip from it.)

[video url="" title="John Lithgow Interview"] [/video]

For a full clip from the season four finale, follow this article's jump - and remember to return to TV Fanatic soon after it concludes for a detailed recap and review of the shocking events!

[video url="" title="The Getaway Clip"] [/video]

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.

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Dexter Quotes

I love Halloween. The one time of year when everyone wears a mask... not just me. People think it's fun to pretend you're a monster. Me, I spend my life pretending I'm not. Brother, friend, boyfriend - All part of my costume collection. Some people might call me a fraud. Let's see if it will fit. I prefer to think of myself as a master of disguise.

Dexter Morgan

There are no secrets in life, just hidden truths that lie beneath the surface.

Dexter Morgan