Written and produced by David E. Kelly, the show is about a father and daughter who run an advertising agency together.
Gellar starred on the iconic supernatural series "Buffy the Vampire Slayer."
Williams is an Oscar-winning actor and stand-up comedian. His film credits include "Good Morning, Vietnam," "Good Will Hunting," "Dead Poets Society," "Awakenings" and "The Birdcage."
Notable deaths of 2014 [PHOTOS]