EXCLUSIVE: Aidan Gillen ( Game of Thrones , Mayor of Kingstown ) has been cast as a key guest star in the FX Untitled Witness Protection pilot , with the possibility for the role to expand if the project is picked up to series.

He joins the previously announced lead cast of Alison Brie, Pablo Schreiber, Zoë Chao, Jamie Neumann and Antonella Rose.

From writers, executive producers and showrunners Hannah Fidell and Gina Welch, the project is a contemporary take on a previously unproduced script by David Chase, who was previously attached. In the Untitled Witness Protection pilot, a violent confrontation drives a high-end D.C. madam, Remy (Brie), to turn on her partner and enter witness protection in seaside Maine with her adolescent daughter.

Gillen will play Carl Milliken III,

See Full Page