Jason Wiles will guest star on an episode of Castle this February.

Most recently seen on Law & Order: Special Victims Unit, Wiles will portray an old friend of Castle's who becomes the main suspect in a murder investigation.

This piece of casting news comes on the heels of newly-released photos that depict Laura Prepon, as Natalie Rhodes, making out with the show's title character.

Check out stills from the January 3 episode of Castle NOW!

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