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Exclusive Castle Sneak Peek: Meet Ryan's Ex-Girlfriend!

Castle | Photo Credits: Richard Foreman/ABC

On Monday’s Castle, Detective Kevin Ryan will get a blast from his past.

When Castle (Nathan Fillion) and Beckett (Stana Katic) investigate a murder that leads back to an Irish crime family Ryan (Seamus Dever) once infiltrated as an undercover narcotics cop, he must step back into his old persona in order to bring the family down.

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