Robin Williams

Actorand comedian Robin Williams arrives at the premiere of the film "World's Greatest Dad" during the Sundance Film Festival in Park City, Utah, in this January 18, 2009 file photo. Williams, 57, will undergo heart surgery for an aortic valve replacement, forcing him to cut short his stand-up comedy tour, his representative said on March 5, 2009. REUTERS/Lucas Jackson/Files (UNITED STATES)

Reuters

En esta imagen de archivo del 18 de enero del 2009, el actor Robin Williams llega al estreno de la cinta "World's Greatest Dad" en el Festival de Cine de Sundance en Park City, Utah. (Foto AP/Matt Sayles, archivo)

AP

Actor Robin Williams arrives for the premiere of the film "World's Greatest Dad" during the Sundance Film Festival in Park City, Utah, in this January 18, 2009 file photo. Williams, 57, will undergo heart surgery for an aortic valve replacement, forcing him to cut short his stand-up comedy tour, his representative said on March 5, 2009. REUTERS/Lucas Jackson/Files (UNITED STATES)

Reuters

Actor Robin Williams celebrates backstage with his award for Favorite Scene-Stealing Guest Star for his role on "Law and Order: SVU" at the 35th annual People's Choice awards in Los Angeles, in this January 7, 2009 file photo. Williams will undergo heart surgery for an aortic valve replacement, forcing him to cut short his stand-up comedy tour, his representative said March 5, 2009. REUTERS/Phil McCarten/Files (UNITED STATES)

Reuters

** FILE ** In this Jan. 18, 2009 file photo, Robin Williams arrives at the premiere of "World's Greatest Dad" at the Sundance Film Festival in Park City, Utah. Williams is canceling several performances in Florida of his one-man comedy show, "Weapons of Self-Destruction," after recently experiencing shortness of breath. Williams had been scheduled to perform Wednesday March 4, 2009 and Thursday at the Seminole Hard Rock Hotel & Casino in Hollywood, Florida; Friday at the UFC Arena in Orlando; and Saturday at the Sundome in Tampa. (AP Photo/Matt Sayles, File)

AP

Robin Williams en una foto de archivo del 18 de enero del 2009 llega a la premiere de la película "World's Greatest Dad" (El mejor padre del mundo) en el Festival de Cine de Sundance en Park City, Utah. (Foto AP/Matt Sayles)

AP

** FILE ** In this Jan. 18, 2009 file photo, Robin Williams arrives at the premiere of "World's Greatest Dad" at the Sundance Film Festival in Park City, Utah. (AP Photo/Matt Sayles, file)

AP

Actor Robin Williams visits the Kari Feinstein Sundance Style Lounge on January 19, 2009 in Park City, Utah.

Barry Brecheisen/WireImage.com

Actor Robin Williams seen around town on January 19, 2009 in Park City, Utah.

George Pimentel/WireImage.com

Actor Robin Williams seen around town on January 19, 2009 in Park City, Utah.

George Pimentel/WireImage.com