The honorary Academy Award winner died Wednesday, his son, actor Michael Douglas, said in an Instagram post.
"Kirk's life was well lived, and he leaves a legacy in film that will endure for generations to come, and a history as a renowned philanthropist who worked to aid the public and bring peace to the planet," Douglas wrote.
It is with tremendous sadness that my brothers and I announce that Kirk Douglas left us today at the age of 103. 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. Kirk's life was well lived, and he leaves a legacy in film that will endure for generations to come, and a history as a renowned philanthropist who worked to aid the public and bring peace to the planet. Let me end with the words I told him on his last birthday and which will always remain true. Dad- I love you so much and I am so proud to be your son. #KirkDouglas
The star of "Spartacus" – the 1960 film that helped to end the Hollywood blacklist – didn't shy away from discussing politics during his career that spanned more than six decades.
In a 2012 interview with Variety, Douglas said of making "Spartacus" that "the [political] climate was similar to the climate we’re having now. And what I mean by that is, there are too many Republicans, too many Democrats, and not enough Americans.”