One of these questions is a Jack Coleman one:
Q | Can you tell us more about Jack Coleman’s character on Castle? Will he be in multiple episodes?
Yes, Coleman will appear in multiple episodes as, we originally reported, “a well-liked U.S. senator who finds himself in conflict with Beckett.” Asked to elaborate during my set visit, Marlowe hesitated, only adding: “I can say that Jack Coleman plays somebody who has some knowledge about what may have gone on back in the day with Montgomery, and may have some information as to what actually went on with Kate’s mother’s murder.”
Source: TV Line