Yancey Arias has booked a two-episode arc on Castle Season 6. (If there is a Castle season 6... hurry back, Nathan Fillion!)
According to TV Line, the veteran actor (who turned up on fellow ABC drama Revenge last season as a shady senator) will portray Carl Villante, the head of an elite investigative unit.
Look for the character to butt heads with Beckett and Castle during the working of a high-stakes investigation.
Does this mean Beckett remains in New York?
The previously-announced casting of Lisa Edelstein as a federal investigator in D.C. appeared to hint in the opposite direction.
But we'll find out for sure when Castle returns with new episodes on September 23.