Robin Williams (18 images)

Robin Williams waits on the set while shooting the movie "Old Dogs" at Shea Stadium in New York City on July 26, 2007. (UPI Photo/John Angelillo)

Comedian Robin Williams watches fellow comedian and New York Yankee, Billy Crystal, warm up before a game against the Pittsburgh Pirates at Legends' Field in Tampa, Florida on March 13, 2008. Crystal signed a one-day contract with the team. Crystal will turn 60 on March 14, and it was his birthday wish to become a New York Yankee team member. (UPI Photo/Cathy Kapulka)

(L-R) John Travolta, Ellen Travolta, Connor Rayburn and Robin Williams react while shooting the movie "Old Dogs" at Shea Stadium in New York City on July 26, 2007. (UPI Photo/John Angelillo) .

Halle Berry and Robin Williams arrive to the world premiere of Robots on March 6, 2005, in Los Angeles. (UPI Photo/John Hayes)