Jason Beghe to Guest Star on Castle

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Jason Beghe will guest star this fall on Castle.

On the show's third episode of the season, viewers will learn more about Beckett's early years on the police force. Beghe's character will play a key role in these revelations, as the actor will come aboard as Kate's training officer.

And we hate to break it to Castle, but there two were an item back in the day.

Jason Beghe

Beghe most recently appeared on episodes of Hawthorne and Californication.

Castle returns on September 20.

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Castle Quotes

Castle: How do you know when you're in love?
Beckett: All the songs make sense.

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