'Mork and Mindy' star Pam Dawber, other celebs react to news of Robin Williams' death

Celebrity colleagues and admirers of Robin Williams shared their reactions Monday to his death at age 63 in an apparent suicide:

— "I am completely and totally devastated. What more can be said?" — Pam Dawber, in a statement.

— "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." — Sally Field, in a statement.

— "Robin was a lightning storm of comic genius and our laughter was the thunder that sustained him. He was a pal and I can't believe he's gone." — Steven Spielberg, in a statement.

— "I could not be more stunned by the loss of Robin Williams, mensch, great talent, acting partner, genuine soul." — Steve Martin, on Twitter.

More On This...

— "I saw him on stage the very first time he auditioned at the Improv and we have been friends ever since. It's a very sad day." — Jay Leno, in a statement.

— "We have lost one of our most inspired and gifted comic minds, as well as one of this generation's greatest actors. To watch Robin work, was a magical and special privilege. His performances were unlike anything any of us had ever seen, they came from some spiritual and otherworldly place. He truly was one of the few people who deserved the title of 'genius.'" — Chris Columbus, in a statement.

— "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." — Chevy Chase, in a statement.

— "Robin was as sweet a man as he was funny. If you're sad, please tell someone." — Jimmy Kimmel, on Twitter.

— "Robin was friend, boss, brother, inspiration. His generosity and intelligence knew no limits." — Harvey Fierstein, on Twitter.

— "I've never known a sweeter, brighter, more considerate person than Robin. Robin's commitment as an artist to lifting our mood and making us happy is compared to none. He loved us all and we loved him back." — John Travolta, in a statement.

— "A big tenacious overflowing hyperkinetic eruption of compassion would be (the) best tribute to Williams." — John Cusack on Twitter.

— "RIP to my dear brother and friend Robin Williams. The world will miss the decades of laughter that you gave all of us."  — Quincy Jones on Twitter.

The Associated Press contributed to this report.

WATCH: Four4Four: Inside Robin Williams' tragic death, and why everyone feels his loss