Castle Season 3 Finale Promo: Who Killed Johanna Beckett?

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Coming off a decent, albeit not spectacular episode, Castle will air its third season finale next Monday.

Titled "Knockout," the hour will bring to the forefront new intel on the murder of Beckett's mother. Information comes to light for this detective when a hitman with knowledge of the crime escapes during a court hearing.

How will the episode turn dark? On what cliffhanger will it conclude? Tune in on May 16 and get excited for the finale via the following official preview:

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

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Castle Quotes

Oh, absolutely not! You will not and do you know why? Because you're a fighter. What have you always told me? No one will give you anything in this life. You must earn it and look at you. Almost 20 years later and you're back on Broadway. You have earned this.

Rick Castle

To bravery, to commitment, to love, to sacrifice.

Ryan