Robin Williams: Remembering him on what would have been his 70th birthday

Williams first shot to stardom with Pam Dawber in the sitcom "Mork & Mindy" in September 1978.

This 1982 file photo originally released by Warner Bros. Pictures shows Williams as T.S. Garp from the film "The World According to Garp."

Williams and his first wife, Valerie Velardi, join a huge number of photographers packed into singer Paul Simon's apartment to celebrate Simon's wedding to actress Carrie Fisher in New York City on August 16, 1983.

Williams, center, takes time out from rehearsal at NBC's "Saturday Night Live" with cast members Eddie Murphy, left, and Joe Piscopo on February 10, 1984. Williams would appear as guest host on the show.

Robin Williams was honored during 2014's Emmy telecast with a tribute led by friend Billy Crystal, who hosted the "Comic Relief" benefits with Williams and Whoopi Goldberg (seen here in 1986).

Williams portrayed a teacher in the movie "Dead Poets Society" in 1989, one of his first mostly dramatic roles.

Williams went to all lengths to stay with his children in the 1993 movie "Mrs. Doubtfire."

From left, Bonnie Hunt, Bradley Pierce, Kirsten Dunst and Williams hold one another in a scene from the 1995 film "Jumanji."

Comedians and co-hosts, from left, Billy Crystal, Whoopi Goldberg and Williams sing and dance the 1940s-era opening number to "Comic Relief VII" on November 11, 1995, in Los Angeles.

Jay Leno laughs as Williams jokes around during a taping of "The Tonight Show with Jay Leno" on November 13, 1995, at the MGM Grand Hotel in Las Vegas.

Williams and his wife, Marsha, pose for photographers with their daughter, Zelda, as they arrive at the premiere of the film "Patch Adams" in December 1998 in New York City.

Williams wears a clown nose as he places his hands in concrete during a ceremony outside Mann's Chinese Theatre in Hollywood in 1998. In the critically acclaimed "Patch Adams," he played a doctor who used humor to help heal his patients

Actor-writers Matt Damon, left, and Ben Affleck, right, pose with Williams, holding the Oscars they won for "Good Will Hunting" at the 70th annual Academy Awards in 1998. Damon and Affleck won for best original screenplay, and Williams won for best supporting actor.

U.S. Postal Service team rider Lance Armstrong rides with Williams during training on a rest day of the 89th Tour de France cycling race in Vaison La Romaine on July 22, 2002.

Williams poses for pictures with U.S. soldiers at the main U.S. base at Bagram, Afghanistan, on December 16, 2004.

Williams and Susan Schneider arrive at the premiere of "World's Greatest Dad" in Los Angeles on August 13, 2009.

Williams at the pre-premiere party for "Happy Feet Two" at the Grand Connaught Rooms in London on November 20, 2011.

Williams poses for photographs in Sydney, Australia, on December 5, 2011. He and Australian director George Miller were in Australia to promote "Happy Feet Two."

Upon his death, Williams' wife, Susan Schneider, said, "This morning, I lost my husband and my best friend, while the world lost one of its most beloved artists and beautiful human beings. I am utterly heartbroken."