Robin Williams and Pam Dawber in the TV series 'Mork and Mindy'
© AP Photo/ABC Robin Williams and Pam Dawber in the TV series 'Mork and Mindy'
© AP Photo/Reed Saxon Robin Williams, third from right, dressed as a cheerleader with the Broncos' Pony Express cheerleaders during the filming of an episode of 'Mork & Mindy'
© AP Photo Actor Robin Williams, shown in character as Popeye in 1980
© AP Photo/Paramount Pictures Robin Williams, center, with Eddie Murphy, left, and Joe Piscopo
© AP Photo/Suzanne Vlamis Robin Williams poses with actress and model Twiggy for the comedy 'Club Paradise', 1986
© AP Photo/Warner Bros Actor Robin Williams plays a harmonica as singer Paul Simon plays a guitar on the set of the 'Saturday Night Live' show
© AP Photo/G. Paul Burnett Robin Williams in 'Mrs. Doubtfire' in 1993
© filmpro.ru Robin Williams and Matt Damon in "Good Will Hunting"
© filmpro.ru Jack Nicholson, right, and Robin Williams share a laugh as they pose with their Oscars in 1998. Williams won the award for his role in 'Good Will Hunting'
© AP Photo/Reed Saxon Williams wears a red nose which he wore in his new movie 'Patch Adams' while dipping his hands in wet cement at the Mann's Chinese Theatre in the Hollywood area of Los Angeles in 1998
© AP Photo/Michael Caulfield Robin Williams and his son Cody in 1998
© AP Photo/Michael Caulfield Robin Williams during a visit to an American military base in Iraq in 2003
© EPA/MIKE THEILER Comedian Conan O'Brien with Robin Williams at a show in New York, 2007
© AP Photo/Evan Agostini