Celebrities react to Robin Williams' death

TIBURON, Calif., Aug. 11 (UPI) -- News of Robin Williams' unexpected death on Monday has flooded the internet with mourning messages for the Hollywood star.

Everyone from his Mrs. Doubtfire co-star Mara Wilson to Mia Farrow to Anna Kendrick has taken to social media to extend their goodbyes to the beloved actor. Williams, 63, died Monday morning of an apparent "suicide due to asphyxia." The actor's publicist issued a statement later that day claiming the actor had been battling "severe depression" for a while and asking the public for privacy at this difficult time.

Williams is survived by his third wife Susan Schneider and his three children, Zachary Pym, 31, Zelda Rae, 25, and Cody Alan, 22.

Here are a few of the messages honoring the actor on Twitter.

Very sad, very upset, very glad I did not have to hear about this though Twitter. Probably going to be taking some time off it for a while.
— Mara Wilson (@MaraWritesStuff) August 11, 2014

I could not be more stunned by the loss of Robin Williams, mensch, great talent, acting partner, genuine soul.
— Steve Martin (@SteveMartinToGo) August 11, 2014

I am heartbroken. Dear, sweet friend, Robin Williams, gone. Our prayers for peace to all his friends and family, his beautiful children.
— Rita Wilson (@RitaWilson) August 12, 2014

"No matter what people tell you, words and ideas can change the world." -Robin Williams... http://t.co/nfI2PPBNBQ
— Vanessa Hudgens (@VanessaHudgens) August 12, 2014

No! Robin Williams you were so loved.
— mia farrow (@MiaFarrow) August 11, 2014

O Captain! My Captain! Rise up and hear the bells. Rise up, for you the flag is flung, for you the bugle trills.
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— Anna Kendrick (@AnnaKendrick47) August 11, 2014

So sad to hear about Robin Williams! Today the world lost one of its brightest and funniest #RIP
— Carmen Electra (@carmenelectra) August 12, 2014

Goddamnit! Robin Williams. Sorry. #RIP
— marc maron (@marcmaron) August 12, 2014

As a kid, I constantly saw Robin Williams riding around town on his bike. He always waved to me & my friends. Pure warmth. RIP.
— Nina Lisandrello (@NinaLisandrello) August 12, 2014

I hope you knew how happy you made us. #RIP Robin Williams
— Ann Curry (@AnnCurry) August 12, 2014

thank you for my childhood memories, you've helped me at my darkest times. Rest in Peace Robin Williams...
— The Weeknd (@theweeknd) August 11, 2014

Just shared a moment of silence on the set for Robin Williams, a man who brought so much laughter, joy and healing to so many.
— Lena Dunham (@lenadunham) August 12, 2014

It is unimaginable that this is the reality today - @hwinkler4real on the loss of #RobinWilliams
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— Anderson Cooper 360° (@AC360) August 12, 2014

A huge loss to this generation and more importantly his loved ones... My condolences . Rest in peace to you RW. #robinwilliams #comicgenius
— Jeremy Renner (@Renner4Real) August 12, 2014

Genie, you're free. pic.twitter.com/WjA9QuuldD
— The Academy (@TheAcademy) August 12, 2014

"Robin Williams was an airman, a doctor, a genie, a nanny ... and everything in between. But he was one of a kind." —President Obama
— Barack Obama (@BarackObama) August 12, 2014