"This morning I lost my husband and my best friend, while the world lost of it's most beloved artists and and human beings. I am utterly heartbroken," Susan Schneider, Williams' wife, said in a written statement, reports CBS San Francisco.

"On behalf of Robin's family, we are asking for privacy during our time of profound grief. As he is remembered, it is our hope the focus will not be on Robin's death but on the countless moments of joy and laughter he gave to millions."

"He has been battling severe depression of late," Mara Buxbaum, Robin Williams' press representative, added in a statement. "This is a tragic and sudden loss."

Williams had checked himself into rehab earlier this year. One of his last roles was on The Crazy Ones, a half-hour sitcom on CBS. The show was canceled earlier this year.

Multiple celebrities took to social media to both offer their condolences and pay tribute to the fallen actor.

So sad about Robin Williams�-
KATY PERRY (@katyperry) August 11, 2014

Aw man, that's terrible news. rest in peace and laughter Robin Williams � You had a great run and touched many lives. That counts.-
(@deadmau5) August 11, 2014

Devastated right now. Loved you Robin-
Brad Paisley (@BradPaisley) August 11, 2014

holy sh*t. R.I.P. robn williams. grew up with that man, what beautiful gifts he gave to us-
Flea (@flea333) August 11, 2014

Robin Williams, a gift to the world. So very very sad. My love and condolences to his family. He is awake, and we are all still sleeping.-
sia (@Sia) August 11, 2014

Thank you to the beautifully original + brave artist that is #RobinWilliams. You taught us how to stand on the edge, fearless, + shine.-
JARED LETO (@JaredLeto) August 11, 2014

Robin Williams is gone. What a crying shame. It's raining in Ohio. I met him fleetingly and he had light in his eyes! He was adorable!-
Boy George (@BoyGeorge) August 11, 2014