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John Lithgow on Board for Season Four of Dexter

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Jimmy Smits guest-starred on season three of Dexter and knocked the role of Miguel Prado out of the park.

Now, sources confirm to Michael Ausiello that the Showtime hit has landed another major name to portray season four's main antagonist:

Look for John Lithgow to join the cast as Walter Simmons, a seemingly unassuming suburbanite who has been living a dual life as one of the country’s most prolific serial killers.

John Lithgow

Dubbed the "Trinity Killer" because he always kills in threes, Simmons relocates to Miami and, as viewers might expect, Dexter becomes obsessed by this man's efficient killing methods, as well as his ability to evade capture for such a long period of time.

Season four of Dexter premieres on September 27.

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

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That's not even 10 muients well spent!

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