Morris (NCIS/Brothers & Sisters) will portray Leslie Morgan, the sister of a woman who is murdered in Central Park. The twist? Her sister was dressed as Little Red Riding Hood and was the victim of an apparent wolf attack. The Vampire Diaries' Kinney has been cast as Leslie's husband.
Both will appear in the episode fittingly titled "Once Upon a Crime," which is slated to air later this winter.
Castle airs Mondays at 10/9c on ABC.