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.

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

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Castle Quotes

I don't get it. He's into you and your determined not to give into these feelings that you clearly have for him. So he fantasizes about you through his writing. It is literally verbal masturbation.

Natalie

I can't tell you how many times I've had dreams of being on this very ship.

Beckett