Hollywood was rocked Monday by the news of Robin Williams's death by his own hand.
"He had been battling severe depression of late," his rep said in a statement. "This is a tragic and sudden loss."
That loss was felt among his fans, friends and former costars, and many took to social media to mourn the loss of one of the industry's greatest legends – one who, as fellow comedian Mike Myers said in a statement, "will be remembered in the company of Chaplin, Keaton and Groucho."
For more on Robin Williams's tragic death and his legacy of comic genius, pick up the latest issue of PEOPLE, on newsstands Friday
If you or someone you know is considering suicide, please contact the National Suicide Prevention Lifeline at 1-800-273-TALK (8255).
The Williams family is asking well-wishers to send contributions to charities close to the actor's heart in lieu of flowers. Suggested organizations include St. Jude Children's Research Hospital, Challenged Athletes, USO, the Muhammad Ali Parkinson Center, the Christopher and Dana Reeve Foundation and Glide Memorial Church in San Francisco.