Robin Williams has signed on to guest star in the 200th episode of Law & Order: SVU, PEOPLE has confirmed.
The show, scheduled to air April 29, will have the comedian playing the dramatic role of Merritt Rook, an engineer whose life takes a profound turn after a dramatic loss. While the script is still in the works, word is that Williams winds up in quite the cat-and-mouse chase with Mariska Hargitay's Det. Olivia Benson and Chris Meloni's Det. Elliot Stabler.