An outpouring of love and mourning have come from celebrities via social media.
Fellow comedic actor Steve Martin tweeted his grief, saying: "I could not be more stunned by the loss of Robin Williams, mensch, great talent, acting partner, genuine soul."
The Crazy Ones co-star Sarah Michelle Gellar simply tweeted a collage of the two of the together.
The folks at Sesame Street tweeted: "We mourn the loss of our friend Robin Williams, who always made us laugh and smile."
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