Many of Robin Williams' colleagues and friends took to Twitter and released statements on Monday after learning about the actor's death.
The actor's publicist said he was battling severe depression. Williams was 63.
Here's how Hollywood was reacting to the sudden and tragic news:
Ellen DeGeneres: I can’t believe the news about Robin Williams. He gave so much to so many people. I’m heartbroken.
Fran Drescher: He taught me to care about everyone on a show. From top to bottom he took time for all. A gr8 talent. Big loss :(
We mourn the loss of our friend Robin Williams, who always made us laugh and smile. pic.twitter.com/UOY8LTjVRA— Sesame Street (@sesamestreet) August 11, 2014
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
Mr. Williams visited me the first day of filming The Parent Trap. I will never forget his kindness. What an enormous loss. My condolences.— Lindsay Lohan (@lindsaylohan) 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
Oh RobinÃ°Å¸ËÂ¥— Cher (@cher) August 11, 2014
Deeply sad to hear Robin Williams has left us. Thank you for the inspiration, man- I wouldn't be doing what I do now if it weren't for you.— Darren Criss (@DarrenCriss) August 11, 2014
Val Kilmer: One of the greatest nights of my youth was spent with dear Robin Williams. Let's all get closer to our friends who are down, and share love.
Tatum O'Neal: I had the great pleasure of mtg Robin Williams he made me laugh.RIP
Sally Field: I feel stunned and so sad about Robin. I'm sad for the world of comedy. And so very sad for his family. And I'm sad for Robin. He always lit up when he was able to make people laugh, and he made them laugh his whole life long.... tirelessly. He was one of a kind. There will not be another. Please God, let him now rest in peace.
Chevy Chase: Robin and I were great friends, suffering from the same little-known disease: depression. I never could have expected this ending to his life, and to ours with him. God bless him and God bless us all for his LIFE! I cannot believe this. I am overwhelmed with grief. What a wonderful man/boy and what a tremendous talent in the most important art of any time – comedy! I loved him.
David Steinberg: Robin Williams and I went on stage together for six months last year playing theaters across the country. Besides seeing his brilliant improvisational mind in action every night was the pleasure in just getting to know him and his generosity and spirit. He looked after Jonathan Winters and put him on his TV shows. He would drive to Santa Barbara weekly to make sure Jonathan was ok. A comic genius looking after another comic genius.Robin looked after everyone. If only he would have looked after himself.
Can’t believe news about @robinwilliams,I’m heartbroken! Praying for his family, loved ones, fans worldwide & peace for his soul…RIP— Gloria Estefan (@GloriaEstefan) August 11, 2014
His heart was as big as his genius. So sad. Rest in Peace Robin Williams.— bob saget (@bobsaget) 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.— Anna Kendrick (@AnnaKendrick47) August 11, 2014
So sad so funny http://t.co/YF9UH5BOYb— Chris Rock (@chrisrock) August 11, 2014
Danny DeVito: So sad to think about this. Hard to speak. Hard to say. Hard to take. All I can think about is what a joy he was to be with. I’m devastated. I'm sending my love to his family and everyone who loved him. My heart is broken by this news.
Twentieth Century Fox Television, Producers Of "The Crazy Ones": He was warm, funny and a true professional. His cast and crew both loved him and loved working with him, and our hearts go out to his family and friends. He was one of a kind.”
HBO: Robin Williams graced HBO for so many years with his uncommon gifts. He never failed to elevate his art and did so with a full, generous and loving heart. Always humble and gracious, Robin was a prince and holds a special place in all our hearts.
FOX: There really are no words to describe the loss of Robin Williams. He was immensely talented, a cherished member of our community, and part of the Fox family. Our hearts go out to his family, friends and fans. He will be deeply missed.
Wil Wheaton: Robin Williams could not have been kinder or more generous when I worked with him in Flubber. My heart goes out to his family.
Rain Pryor: RIP Robin Williams, hope daddy and Carlin were there to greet you. My heart is broken.
Julianne Moore: Such a terrible loss. Robin Williams was a great talent and a lovely, kind man.
RIP to one of the greatest comedic and dramatic actors of our time. We will miss you. #NaNuNaNu— Jenny McCarthy (@JennyMcCarthy) August 11, 2014
Famously kind, ferociously funny, a genius and a gentle soul. What a loss. #RobinWilliams— Michael J. Fox (@realmikefox) August 12, 2014
Omg RIP #RobinWilliams. So sad. We love you and will miss you and your talent.— Laverne Cox (@Lavernecox) August 12, 2014
The world has lost a comic genius & huge talent. Interviewing Robin Williams was like taking the wildest roller coaster ride of your life.— Katie Couric (@katiecouric) August 11, 2014
The first autograph I ever got: Dear money, send mom. Robin Williams— John Stamos (@JohnStamos) August 11, 2014
Ken Burns: Funniest, most manic comedian since his mentor Jonathan Winters. We'll miss his riotous anarchy. Mark Twain said "the secret source of humor itself is not joy, but sorrow. There is no humor in heaven." Sometimes our funniest have been our saddest. But there IS humor in heaven now.
Kumail Nanjiani: I've erased & retyped & erased so many more thoughts about Robin Williams. So I'll just say I feel very sad.
Sarah Rafferty: Oh what a loss. RIP Robin Williams. We were in awe of you.
Sean Astin: ROBIN WILLIAMS Thank you for your galactic talent & unimaginable energy.
Wayne Brady: Robin Williams RIP. Truly one of the most talented men in the history of show business. What a loss. To lose those who make us laugh...wow.
Peter Fonda: So sad Robin Williams was a special friend and I will miss him forever.
Sarah Jessica Parker: Robin Williams, an original. Godspeed. X, sj
Marcia Cross: So sad to hear about #RobinWilliams. A gift to heaven, a loss to the earth. xo m
Taylor Swift: Heartbroken for Robin Williams and his family.
Ben Stiller: I met Robin when I was13 at the Improv. I was there with my parents who were maybe performing and it was crowded and I heard this voice behind me saying "Stay close to your mother you'll be safe! Stay close to your mother you'll be safe!" I turned around and it was Robin. For a 13 year old who was a huge 'Mork and Mindy' fan it was sort of like the end of the world. I never forgot it. So working with him years later I always had this little voice inside of me going "you are acting with Robin Williams! This is the coolest thing ever!"...I never got over being a fan. I think most people my age have the same feeling -- that he and Steve Martin and Bill Murray sort of represented what it meant to be funny. His kindness and generosity is what I think of. How kind he was to anyone who wanted to connect with him. And he could not help but be funny all the time. He would do something as long as it would keep you laughing. He made many, many film crews laugh out loud before the audiences ever saw it. He made such a big impact on the world. So there is the man, and his talent, and I think in his case both were extraordinary.
St. Jude Children's Research Hospital: Today the world lost an iconic man and entertainer, and St. Jude Children's Research Hospital lost an incredible friend and supporter. We send our deepest sympathies to the family and loved ones of Robin Williams. Mr. Williams generously gave his time to raise awareness and funds for St. Jude and for our patients battling childhood cancer. His humor brought bright smiles and laughter to our patients and families and his generosity deeply touched the hearts of all who knew him. He and his family remain in our thoughts and prayers.
Tony Thomas (Producer of "Dead Poets Society" & St. Jude Thanks & Giving Spots On Behalf Of The Thomas Family): Marlo and I and our St. Jude family are heartbroken. The only thing that surpassed Robin's brilliance was his overflowing generosity. Our thoughts are with his children, his wife and his family. We will miss our dear friend.
No words can express the sadness I feel for this tragic loss. My prayers are with the Williams family. RIP Robin Williams. -ZS— Zoe Saldana (@zoesaldana) August 11, 2014
When I worked at the factory I dreamed I worked with Robin Williams and he was kind and hilarious but real life Robin was even better. #RIP— Tom Arnold (@TomArnold) August 11, 2014
Without #Robin Williams there wouldn't have been a Comedy scene in San Francisco, Robin paved the way. He was the best of all of us— Rob Schneider (@RobSchneider) August 11, 2014
So sad to hear about Robin Williams. Thank you for sharing your gift with the world and bringing so much joy to so many people. RIP— Chord Overstreet (@chordoverstreet) August 11, 2014
My hero. My idol. My friend. I'm sick and shocked. Goodbye #RobinWilliams. You are now for the ages.— Josh Gad (@joshgad) August 11, 2014
How shocking and sad to hear of Robin Williams death. Such a huge talent. My sympathies go out to his family and friends.— Marg Helgenberger (@MargHelgen) August 11, 2014
Such devastating news. More than sad. RIP Robin Williams.— Gabourey Sidibe (@GabbySidibe) August 11, 2014
Rest in peace Robin Williams I hope you found what you were looking for— Todd Bridges (@ToddBridges) August 11, 2014
RIP #RobinWilliams Ã°Å¸ËÂ¥— Lucy Liu (@LucyLiu) August 11, 2014
Devastating loss. Our hearts go to Robin Williams family.— Ali Larter (@TheRealAliL) August 11, 2014
I'm shocked and saddened over the loss of Robin Williams. I had the great pleasure of working with him on Old Dogs. #RobinWilliams— Lori Loughlin (@LoriLoughlin) August 11, 2014
I'm stunned! pic.twitter.com/X2RbDRyFxt— Bill Cosby (@BillCosby) August 12, 2014
Genie. You're free. pic.twitter.com/FWQWPDPP42— Evan Rachel Wood (@evanrachelwood) August 11, 2014
Morgan Fairchild: How can Robin Williams be gone? 1 of the kindest men & biggest talents ever! Working on Mork & Mindy was 1 of the highlights of my life!
Dylan McDermott: Rest in peace Robin Williams... The few times I spoke with him he was incredibly kind. You will be missed.
Wu Tang Clan: A CLASSIC LEGEND ...ROBIN WILLIAMS ...PEACE
Dot-Marie Jones: SO SAD ABOUT THE DEATH OF ROBIN WILLIAMS BREAKS MY HEART! I WAS LUCKY TO WORK WITH HIM IN PATCH ADAMS ! REST IN PEACE SWEET MAN!
One of my all time favourites. Movies I grew up watching over and over again. A genius that will be so missed. R.I.P. Robin Williams.— Harry Styles (@Harry_Styles) August 12, 2014
-- Jesse Spero & Jolie Lash