Castle First Look Photo: Who is Sully?

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We're less than two weeks away from learning the answer to the most pressing question of Castle Season 6:

Will Kate accept Rick's proposal?

But while we can't reveal that answer just yet, we can give fans their first look at Joshua Bitton, who will debut as Detective Grant Sullivan on Episode 3 and stick around the 12th Precinct as a law enforcement officer set on proving himself to Castle and company. Will be replacing a D.C.-bound Beckett at work?

The actor - who has appeared on such dramas as Vegas, Private Practice, Justified - stands below with Nathan Fillion's title character and Seamus Dever's Ryan in this EXCLUSIVE Season 6 photo. Check it out now:

Joshua Bitton as Sully
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Jim Halterman is the West Coast Editor of TV Fanatic and the owner of JimHalterman.com. Follow him on Twitter.

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Castle Quotes

Sometimes the hardest things in life are the things most worth doing.

Castle

Kate Beckett: You texted Castle and not me?
Kevin Ryan: Well, when you have a crazy theory you don't call the voice of reason.