It's always hard to say goodbye. 

Legendary film actor Kirk Douglas passed away on Wednesday at the age of 103. The actor starred in such films as Spartacus, Champion, and Lonely Are the Brave over the course of his long career in Hollywood. Beyond the big screen, the actor was most widely known for his relationship with his family, and especially his son and fellow actor Michael Douglas and his wife Catherine Zeta-Jones

"To my darling Kirk," Zeta-Jones shared on Instagram, "I shall love you for the rest of my life. I miss you already. Sleep tight..."

Michael has always been open about expressing how much he looks up to and admires his father, and was the one to confirm the news of his passing on Instagram. 

"It is with tremendous sadness that my brothers and I announce that Kirk Douglas left us today at the age of 103," he wrote alongside a throwback photo of his father. "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." 

He continued, "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." There is no doubt that Kirk's absence will leave a major empty space in Hollywood. 

To celebrate his life, scroll through the pictures below of Kirk, Michael and Catherine's sweet bond. 

Kirk Douglas, Michael Douglas, Catherine-Zeta Jones

Theo Wargo/WireImage

Kirk Douglas, Michael Douglas, Catherine-Zeta Jones

Ron Antonelli/NY Daily News Archive via Getty Images

Kirk Douglas 90th Birthday, Michael Douglas, Catherine-Zeta Jones

Alex Berliner/BEI/Shutterstock

Kirk Douglas, Golf, Michael Douglas, Catherine-Zeta Jones

Berliner Studio/BEImages/Shutterstock

Kirk Douglas, Michael Douglas

Instagram

Kirk Douglas, Catherine Zeta-Jones, Michael Dougles

Taylor Hill/FilmMagic

Michael Douglas, Kirk Douglas

Alberto E. Rodriguez/Getty Images

Kirk Douglas, Michael Douglas, Catherine-Zeta Jones

Chris Pizzello/Invision/AP

Kirk Douglas, Michael Douglas, Cameron Douglas, It Runs in the Family

MGM

Kirk Douglas, Catherine Zeta-Jones

Instagram

Our thoughts are with the Douglas family during this difficult time. 

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