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Robin Williams at UC Berkeley Life Sciences Lab. (Photo by Phil Bray/Provided by Discovery Communications) ( AE12SLIDE )

Promotional studio portrait of American comedians and Robin Williams, Whoopi Goldberg and Billy Crystal, the hosts of the 'Comedy Relief' variety benefit special, 1986. (Photo by HBO/Getty Images) ( T751274_02 )

Presenter Robin Williams speaks onstage during the 65th Annual Primetime Emmy Awards held at Nokia Theatre L.A. Live on September 22, 2013 in Los Angeles, California. (Photo by Kevin Winter/Getty Images) ( 180619698NW00038_65th_Annua )

Actor-comedian Robin Williams, third from right, dressed as a cheerleader with the Broncos' Pony Express cheerleaders during the filming of an episode of "Mork & Mindy," in Denver on Nov. 12, 1979. Williams, whose free-form comedy and adept impressions dazzled audiences for decades, has died in an apparent suicide. He was 63. The Marin County Sheriff's Office said Williams was pronounced dead at his home in California on Monday, Aug. 11, 2014. The sheriff's office said a preliminary investigation showed the cause of death to be a suicide due to asphyxia. (AP Photo/File) ( Obit Robin Williams )

Comedian Robin Williams dons a Broncos' Pony Express cheerleader outfit and joins the girls in filming an episode for the television show "Mork & Mindy" at Denver's Mile High Stadium, Nov. 12, 1979. (AP Photo) ( Robin Williams 1979 )

Zelda Williams, at left, and Robin Williams arrive to the premiere of Old Dogs on Monday Nov. 9, 2009, in Los Angeles. (AP Photo/Katy Winn) ( Old Dogs Premiere LA )

Robin Williams on the set of ABCs "Mork and Mindy" in 1978. Williams, whose free-form comedy and adept impressions dazzled audiences for decades, has died in an apparent suicide. He was 63. The Marin County Sheriff's Office said Williams was pronounced dead at his home in California on Monday, Aug. 11, 2014. The sheriff's office said a preliminary investigation showed the cause of death to be a suicide due to asphyxia. (AP Photo/ABC, File) ( Obit Robin Williams )

Actor Robin Williams poses for a portrait during the Happy Feet Press Junket in Beverly Hills, Calif. on Saturday, Nov. 5, 2011. (AP Photo/Dan Steinberg) ( Robin Williams Portraits )

Academy Award winner Robin Williams returns to series television in THE CRAZY ONES, CBS's new single camera workplace comedy about a larger-than-life advertising genius whose unorthodox methods and unpredictable behavior would get him fired, if he weren't the boss. In this photo, Williams, who portrays Simon Roberts, enters his workplace. (Cliff Lipson/CBS © 2013 CBS Broadcasting, Inc. All Rights Reserved.) ( AE19TVOSTROW )

"The Crazy Ones" - Academy Award winner Robin Williams returns to series television in THE CRAZY ONES, CBS's new single camera workplace comedy about a larger-than-life advertising genius whose unorthodox methods and unpredictable behavior would get him fired, if he weren't the boss. Simon Roberts (Williams) is the head of a powerful agency, with the biggest clients and brands in the world, but even more important to him is that his daughter Sydney (Sarah Michelle Gellar) is by his side. (Photo by Richard Cartwright/CBS ©2013 CBS Broadcasting, Inc. All Rights Reserved.) ( AE19TVOSTROW )

This film image released by The Weinstein Company shows Robin Williams as Dwight Eisenhower, left, and Forest Whitaker as Cecil Gaines in a scene from "Lee Daniels' The Butler." From "12 Years a Slave" to "The Butler" to "Fruitvale Station," 2013 has been a banner year for movies directed by black filmmakers. (AP Photo/The Weinstein Company, Anne Marie Fox) ( Hollywood Diversity )

Actor Robin Williams sits onstage with the audience during MTV's Total Request Live at the MTV Times Square Studios on April 27, 2006 in New York City. (Photo by Peter Kramer/Getty Images) ( 57424095LS065_MTV_TRL_With_ )

Susan Schneider and Robin Williams arrive at the premiere of Walt Disney Pictures' 'Old Dogs' at the El Capitan Theatre on November 9, 2009 in Hollywood, California. (Photo by Jason Merritt/Getty Images) ( 58875028 )

(L-R) Milo Jacob Manheim, actress Zelda Williams and actor Robin Williams attend the Premiere of Warner Bros. Pictures' "Happy Feet Two" at Grauman's Chinese Theatre on November 13, 2011 in Hollywood, California. (Photo by Kevin Winter/Getty Images) ( 67297903 )

Actor Robin Williams gets slimed onstage at the 19th Annual Kid's Choice Awards held at UCLA's Pauley Pavilion on April 1, 2006 in Westwood, California. (Photo by Kevin Winter/Getty Images) ( 57217317CA047_19th_Annual_K )

Left, broadway star Harvey Fierstein and actor Robin Williams at the 45th Annual Grammy Awards at Madison Square Garden on February 23, 2003 in New York City. (Photo by Frank Micelotta/Getty Images) ( 1806428FM449_grammys )

Actor Robin Williams (R) and television personality Robin Leach auction off items to guests during "Celebrity Fight Night IX" fundraiser at the Arizona Biltmore Hotel on March 15, 2003 in Phoenix, Arizona. Celebrity Fight Night is a non-profit organization which raises money for several national research centers and charities. (Photo by Robert Mora/Getty Images) ( 1849057RM040_fight )

Robin Williams at "The Tonight Show with Jay Leno" at the NBC Studios in Burbank, Ca. Thursday, Sept. 12, 2002. Photo by Kevin Winter/ImageDirect. ( id_leno_9_12_14.JPG )

Actor/comedian Robin Williams entertains the troops during the United Service Organizations (USO) tour at Baghdad International Airport on December 16, 2003. (Photo by Lisa M. Zunzanyika/U.S. Air Force via Getty Images) ( 2814477HO301_wlliams )

Bebe (Susan Sarandon, left), Father Moinighan (Robin Williams, center) and Don (Robert De Niro, right) in THE BIG WEDDING. (Photo by Barry Wetcher, Provided by Lionsgate) ( AE26SCWEDDING )

Academy Award-winning actor Robin Williams wears a clown nose as he places his hands in cement during his hand and footprint ceremony outside Mann's Chinese Theatre 22 December in Hollywood, California. Williams is currently starring in the critically acclaimed film "Patch Adams" about a doctor who uses humor to help heal his patients. Vince Bucci/AFP/Getty Images ( SAWH981222430350 )

US comedian Robin Williams(R) celebrates with doubles partner Pete Sampras(L) after hitting a winning volley past Andre Agassi at the University of California-Los Angeles 26 July 1999. Sampras and Williams played Agassi and US comedian Billy Crystal in a 15-minute charity match which opened the 8th Annual Mercedes-Benz Cup. LUCY NICHOLSON/AFP/Getty Images ( SAWH990727695950 )

Actors-writers Matt Damon (L) and Ben Affleck (R) pose with actor Robin Williams with their Oscars they won for "Good Will Hunting" at the 70th Annual Academy Awards 23 March in Los Angeles. Damon and Affleck won Best Original Screenplay and Williams won for Best Supporting Actor. (Photo credit should read HAL GARB/AFP/Getty Images) ( SAWH980324231690 )

Oscar winners Robin Williams (L), Best Supporting Actor and Jack Nicholson (R), Best Actor pose for photographers 23 March at the 70th Annual Academy Awards at the Shrine Auditorium in Los Angeles. Williams won for his roll in "Good Will Hunting" and Nicholson for "As Good As It Gets." HECTOR MATA/AFP/Getty Images ( SAWH980324231620 )

Actor Robin Williams holds the Oscar he won for Best Supporting Actor for his role in "Good Will Hunting" during the 70th Annual Academy Awards 23 March in Los Angeles, CA. HAL GARB/AFP/Getty Images ( SAWH980324231120 )

Actor-comedian Robin Williams speaks on stage at the "Idol Gives Back" fundraising special of "American Idol" in Los Angeles on April 6, 2008. Williams, whose free-form comedy and adept impressions dazzled audiences for decades, has died in an apparent suicide. He was 63. The Marin County Sheriffís Office said Williams was pronounced dead at his home in California on Monday, Aug. 11, 2014. The sheriffís office said a preliminary investigation showed the cause of death to be a suicide due to asphyxia. (AP Photo/Mark J. Terrill, File) ( Obit Robin Williams )

Actor-comedian Robin Williams dances 10 July in Los Angeles with the Disney character "Genie" during a celebration for the scheduled 13 August world release of the film "Aladdin and the King of Thieves". Williams who plays the voice of "Genie" in the third sequel to the Aladdin trilogy entertained an audience of 5,000. The movie will be the first in the trilogy to be released direct to the home video market instead of in the movie theaters. JOHN T. BARR/AFP/Getty Images ( APW2001011567277 )

Singer Stevie Wonder(L) and comedian Robin Williams(R) joke with members of "The Saxaphone Club," a club for younger members of the Democratic Party, in Washington 09 May. US President Bill Clinton later spoke at the club after he attended a fund raising event for the Democratic National Committee(DNC) earlier in the evening. PAUL RICHARDS/AFP/Getty Images ( APW2001101016700 )

Comedians Billy Crystal (L) and Robin Williams host HBO's "Comic Relief VII" to raise money for the nation's homeless 11 November in Universal City, California. Also hosting the show was comedian Whoopi Goldberg. DAN GROSHONG/AFP/Getty Images ( APW2002060557270 )

Actor Robin Williams auctions off items to guests during "Celebrity Fight Night IX" fundraiser at the Arizona Biltmore Hotel on March 15, 2003 in Phoenix, Arizona. Celebrity Fight Night is a non-profit organization which raises money for several national research centers and charities. (Photo by Robert Mora/Getty Images) ( 1849057RM012_fight )

Actor Robin Williams (L) presents the Pioneer Award to actor Jonathan Winters onstage during the 6th annual "TV Land Awards" held at Barker Hangar on June 8, 2008 in Santa Monica, California. (Photo by Kevin Winter/Getty Images for TV Land) ( 55083354 )

Host Vanessa Williams (L) and actor Robin Williams dance onstage during the 6th annual "TV Land Awards" held at Barker Hangar on June 8, 2008 in Santa Monica, California. (Photo by Kevin Winter/Getty Images for TV Land) ( 55083472 )

Robin Williams, right, jokes with presenter Halle Berry as he accepts the favorite funny male star award at the 33rd Annual People's Choice Awards on Tuesday, Jan. 9, 2007, in Los Angeles. (AP Photo/Kevork Djansezian) ( APTOPIX Peoples Choice Awards Show )

Comedian/actor Robin Williams (L) appears on "The Tonight Show with Jay Leno" at the NBC Studios on October 14, 2004 in Burbank, California. (Photo by Kevin Winter/Getty Images) ( 51472147KW053_leno )

Comedian/actor Robin Williams (L) appears on "The Tonight Show with Jay Leno" at the NBC Studios on October 14, 2004 in Burbank, California. (Photo by Kevin Winter/Getty Images) ( 51472147KW060_leno )

Actor Robin Williams (R) and wife Marsha Garces Williams (L) arrive at the premiere of Universal Pictures "Man of the Year" at Grauman's Chinese Theatre October 4, 2006 in Hollywood, California. (Photo by Frazer Harrison/Getty Images) ( 72069060CA037_Premiere_Of_U )

1996 Robin Williams stars in his new movie "Jack." (STR/Getty Images) ( jack22000052_20010706_00561.jpg )

ROBIN WILLIAMS IN JUMANI. (Getty Images) ( jumanji12000_20010706_01707.jpg )

ROBIN WILLIAMS IN JUMANI. (Getty Images) ( jumanji32000_20010706_01709.jpg )

Robin Williams performs at the 6th Annual Stand Up For Heroes benefit concert for injured service members and veterans on Thursday, Nov. 8, 2012 in New York. (Photo by Charles Sykes/Invision/AP) ( Stand Up For Heroes )

Robin Williams appears on stage at Comedy Central's "Night Of Too Many Stars: An Overbooked Concert For Autism Education" at the Beacon Theatre in New York on Oct. 2, 2010. (AP Photo/Charles Sykes, file) ( Theater Robin Williams )

Actor and comedian Robin Williams posing to promote his film, "License To Wed" in Santa Monica, Calif on June 15, 2007. Williams, whose free-form comedy and adept impressions dazzled audiences for decades, has died in an apparent suicide. He was 63. The Marin County Sheriffís Office said Williams was pronounced dead at his home in California on Monday, Aug. 11, 2014. The sheriff's office said a preliminary investigation showed the cause of death to be a suicide due to asphyxia. (AP Photo/Reed Saxon, File) ( Obit Robin Williams )

Actor Robin Williams attends the Brady Center to Prevent Violence Benefit at the Beverly Hilton Hotel on October 7, 2004 in Beverly Hills, California. (Photo by Stephen Shugerman/Getty Images) ( 51403353SS008_bradycenter )

US actor Robin Williams arrives for the European premiere of "Happy Feet Two" in central London on November 20, 2011. CARL COURT/AFP/Getty Images ( Par6668243 )

Robin Williams in character as disc-jockey Adrian Cronauer in director Barry Levinsons comedy drama, "Good Morning Vietnam" in 1987. Williams, whose free-form comedy and adept impressions dazzled audiences for decades, has died in an apparent suicide. He was 63. The Marin County Sheriff's Office said Williams was pronounced dead at his home in California on Monday, Aug. 11, 2014. The sheriff's office said a preliminary investigation showed the cause of death to be a suicide due to asphyxia. (AP Photo/Touchstone Pictures) ( Obit Robin Williams )

Actor Robin Williams as T.S. Garp from the film, "The World According to Garp" in 1982. Williams, whose free-form comedy and adept impressions dazzled audiences for decades, died Monday, Aug. 11, 2014, in an apparent suicide. Williams was 63. (AP Photo/Warner Bros., File) ( APTOPIX Obit Robin Williams )

Actor Robin Williams, left, in character as ex-Chicago fireman Jack Moniker poses with actress and model Twiggy, also in character for the comedy Club Paradise, 1986. (AP Photo/Warner Bros) ( Robin Williams and Twiggy 1986 )

Actor Robin Williams and Actress Pam Dawber on the set of ABCs Mork and Mindy, Jan., 1979. (AP Photo/ABC) ( Robin Williams and Pam Dawber 1979 )

U.S. Rep. Jared Polis, D-Colo., and his son AJ leave flowers at the home where the 80's TV series "Mork & Mindy", starring the late Robin Williams, was set, in Boulder, Colo., Monday Aug. 11, 2014. Robin Williams, the Academy Award winner and comic supernova whose explosions of pop culture riffs and impressions dazzled audiences for decades and made him a gleamy-eyed laureate for the Information Age, died Monday in an apparent suicide. He was 63. (AP Photo/Brennan Linsley) ( Boulder Robin Williams Reax )