Seasoned actor and  Hart to Hart  star Robert Wagner has revealed his sister, Mary Jane, has died.

The 93-year-old shared the news on his Instagram account, sharing photos of his late sister and a sweet tribute.

“Today is a very hard day,” he wrote. “Early this morning, my sister, Mary, passed away.”

The post continued, “while she is no longer in pain, she will be terribly missed. Please keep her children and grandchildren in your thoughts.”

Wagner also tagged the accounts of his family members alongside the hashtags #LoveMySister, #Loved, #RIP and #Family.

The star recently turned 93 and took to Instagram to show his appreciation for family, friends and fans, saying, “It’s been a wonderful birthday for me and you all have made it extra special,”

He paired his post with the simple caption, “Thank you all for the birthday wishes. I love you all so much.”

Fellow celebs wished him the best for his special day, “Your the best RJ you’ve given us all so many great years of your talent and grace. Happy birthday.” wrote Frank Stallone.

“Happy Birthday dear RJ.” Mia Farrow wrote.

The actor is best known for his role in  Hart to Hart, as well as his two-time marriage to  West Side Story  actress Natalie Wood. The pair were first married from 1957 to 1962 and then again from 1972 to 1981. Their marriage ended after Wood died from drowning while out with Wagner on their yacht.

Later, Wagner married  Diamonds Are Forever  Bond girl Jill St. John in 1990, who was friends with Woods. The two are still happily married.

Wagner was also known for roles, including the films  The Pink Panther  (1963), the  Austin Powers  series and TV show  It Takes a Thief.

Image credit: Instagram