Michael Douglas confirmed the news -- first reported by People -- in a statement posted to social media, where he honored his father with a touching message.
"It is with tremendous sadness that my brothers and I announce that Kirk Douglas left us today at the age of 103," he wrote, in part. "To the world, he was a legend, an actor from the golden age of movies who lived well into his golden years, a humanitarian whose commitment to justice and the causes he believed in set a standard for all of us to aspire to. But to me and my brothers Joel and Peter he was simply Dad, to Catherine, a wonderful father-in-law, to his grandchildren and great-grandchild their loving grandfather, and to his wife Anne, a wonderful husband."
"Legendary actor Kirk Douglas has passed on today at the age of 103. An Academy Award winning actor and recipient of the Presidential Medal of Freedom, Douglas was a champion for many just causes and lived a long and storied life. He was adored and beloved, and he shall be missed," George Takai tweeted.
Legendary actor Kirk Douglas has passed on today at the age of 103. An Academy Award winning actor and recipient of the Presidential Medal of Freedom, Douglas was a champion for many just causes and lived a long and storied life. He was adored and beloved, and he shall be missed.
In a statement obtained by The Hollywood Reporter, Steven Spielberg said he was "honored" to have known the late actor.
“Kirk retained his movie star charisma right to the end of his wonderful life and I’m honored to have been a small part of his last 45 years,” the filmmaker shared in the statement. “I will miss his handwritten notes, letters and fatherly advice, and his wisdom and courage — even beyond such a breathtaking body of work — are enough to inspire me for the rest of mine.”
Lee Purcell said working with Kirk Douglas was a "joyful and humbling experience."
"It is with great sadness and respect that I reflect upon the passing of Kirk Douglas," Purcell said in a statement to ET. "When we worked together on the feature film Eddie Macon's Run, it was a joyful and humbling experience to see Kirk, already the icon of icons for decades, come bounding onto the set each day brimming over with enthusiasm and energy. He set a fine example for everyone from cast to crew to execs. I have a lovely note he sent me just a couple of months ago on my office wall visible as I write this that I will always treasure. Bon Voyage, Kirk, you are a true mensch. My deepest condolences to Anne, Michael and the rest of the family."
ET's Kevin Frazier also spoke with the acclaimed actress Alfre Woodard at her annual pre-Oscars Sistahs Soiree in Hollywood, and she opened up about the late star's impact and influence on Hollywood.
"I met him a couple of times, and I just remember he was so present and thoughtful and kind, and a gentleman," Woodard shared. "He was a good man and a wonderful actor. He was always one of those people you could look to and realize that you could be a good human being, and be a star, and being in the business."
"But I smile and celebrate that he had 103 years," she added. "You could not live a more beautifully expressive life than his."
Here's a look at how Hollywood is remembering the legendary actor.
KIrk Douglas will always be an icon in the pantheon of Hollywood. He put himself on the line to break the blacklist. My love goes out to my friend Michael and the whole family.
Heartbroken. Kirk Douglas was a friend and an absolute legend of a star and human. He got better with every passing day. So honored to have known him. My love to his family. We could use a true Spartacus. #ripkirkdouglas
Bravo Kirk Douglas on an incredible life. Thank you for so generously sharing your amazing talent with all of us. The film we made together will always hold a special place in my heart. My love to Anne & your beautiful family. #KirkDouglas
Kirk Douglas made a lot of great movies. He had a very fulfilling 103 years. He has a lot of fans who will always remember his great performances as an actor. My heart and prayers go out to his family.
We remember Hollywood legend and @sagaftra member Kirk Douglas. With over 92 acting credits to his name from 'Spartacus' to '20,000 Leagues Under the Sea' he leaves behind a legacy of classic films and roles. Our condolences to his friends and family.https://t.co/vY2OY8uTSh
“I wanted to be an actor ever since I was a kid in the second grade. I did a play, and my mother made a black apron, and I played a shoemaker. After the performance, [my father] gave me my first Oscar: an ice cream cone.” -Kirk Douglas
The REAL SPARTACUS HAS PASSED - we mourn the loss of the “RAGPICKERS SON “ the GREAT KIRK DOUGLAS - What a LIFE 103 we mourn and celebrate his loss - Condolences to the family pic.twitter.com/vxxEZOZ4Tn