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Actor Robin Williams participates in the "The Crazy Ones" panel at the 2013 CBS Summer TCA Press Tour at the Beverly Hilton Hotel in Beverly Hills, California, July 29, 2013.

Robin Williams presents a tribute to Jonathan Winters on stage at the 65th Emmy Awards at Nokia Theater, Sept. 22, 2013, in Los Angeles.

Robin Williams gestures during a panel discussion for his upcoming HBO show "Robin Williams: Weapons of Self-Destruction" at the Television Critics Association Cable summer press tour in Pasadena, California, July 30, 2009.

Actor Robin Williams arrives at the premiere of the film "World's Greatest Dad" during the Sundance Film Festival in Park City, Utah, Jan. 18, 2009.

Cast member Robin Williams arrives at the premiere of "World's Greatest Dad" in Los Angeles, Aug. 13, 2009.

Actor Robin Williams (R) gets slimed by show host Jack Black at the 19th annual Nickelodeon's Kids' Choice Awards at UCLA's Pauley Pavilion in Los Angeles, April 1, 2006.

U.S. comedian Robin Williams, third from left, poses for photographs with U.S. soldiers at a U.S base in Kabul, Afghanistan, Dec. 20, 2007. Some 500 American soldiers watched an all-star USO cast perform under a steady snowstorm.

Comedian Robin Williams holds his Grammy Award to his ear as he poses for photographers at the 45th annual Grammy Awards at New York's Madison Square Garden, Feb. 23, 2003. Williams won the Grammy for Best Spoken Comedy Album for "Robin Williams Live 2002."

Comedian Robin Williams, wearing a camouflage jacket, entertains a cheering crowd of U.S. Army troops at Baghdad airport, Iraq, Dec. 16, 2003.

Robin Williams (C) sings the nominated song "Blame Canada" from the movie "South Park: Bigger, Longer and Uncut" during the Academy Awards, March 26, 2000.

Actor and comedian Robin Williams (C) shares a laugh with rescue workers near the site of the World Trade Center collapse in lower Manhattan, Oct. 17, 2001. Williams spent time with rescue workers as well as surprising their wives with phone calls.

Comedians Robin Williams (R), Billy Crystal (L) and Whoopi Goldberg share a hug on the stage of New York's Radio City Music Hall at the end of HBO's "Comic Relief 8" show, June 14, 1998. The comedians served as hosts for the show that raises funds for homeless projects in over 20 American cities.

Oscar winners (L-R) Matt Damon, Robin Williams and Ben Affleck hold their Oscars for their work on the film "Good Will Hunting" at the 70th Annual Academy Awards, March 23, 1998, in Los Angeles. Damon and Affleck won for Best Screenplay Written Directly for the Screen and Williams won for Best Supporting Actor.

Academy Award-winning actor Robin Williams, wearing a prop from his new film "Patch Adams" places his handprints in cement during ceremonies to honor him at Mann's Chinese Theater, in Hollywood, Dec. 22, 1998.

Actress Pam Dawber (L) shares a laugh with actor Robin Williams as they pose for photographers before the annual American Museum of the Moving Image Tribute dinner, Feb. 23, 1995, in New York. Williams and Dawber starred in the TV show "Mork and Mindy."

Comedian Robin Williams, who starred in "The World According to Garp," is shown, July 21, 1982, in Los Angeles. (AP Photo)