Jamie Lee Curtis and Kelly Lee Curtis in 2012Credit: Eric Charbonneau/WireImage

Kelly Lee Curtis in 2012Credit: Barry King/FilmMagic/Getty Images

Tony Curtis, Benjamin Curtis, Kelly Curtis, Nicholas Curtis, Allegra Curtis and Jamie Lee Curtis in 1989Credit: Ron Galella, Ltd./Ron Galella Collection/Getty

Jamie Lee Curtis’ Sister Kelly Lee Curtis Dies at 69: ‘My First Friend and Lifelong Confidant’

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Kelly Lee Curtis, an actress and the sister of Jamie Lee Curtis, died on Saturday, May 30, at age 69

Jamie wrote in an Instagram tribute that Kelly was her “first friend” and praised her style, generosity and love for nature

Kelly is the daughter of late actors Tony Curtis and Janet Leigh

Kelly Lee Curtis — the sister of Jamie Lee Curtis and the eldest daughter of Tony Curtis and Janet Leigh — has died. She was 69.

Kelly died “at peace” at her California home on Saturday, May 30, according to Jamie, 67, who announced the death in a touching Instagram post. The cause of death has not been shared at this time.

“A warm aloha to my older sister, Kelly Lee Curtis. She passed away this morning. In her home. In nature. At peace,” the Oscar winner wrote alongside a black-and-white photo of her late sister.

Jamie Lee Curtis mourns sister Kelly Lee Curtis
Jamie Lee Curtis offered a heartfelt tribute for her older sister, saying she passed peacefully and was ‘surrounded by nature.’ The loss marks a somber moment for the Curtis family, resonating with fans of both actresses.

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Look: Jamie Lee Curtis mourns the death of sister, actress Kelly Lee Curtis

Jamie added that Kelly was “my first friend and lifelong confidant.”

“She was jaw-droppingly beautiful and a talented actress,” she continued. “She played a mean game of hearts, collected turtles, loved her family, nature, music, thrifting, travel … She was proud of her Danish roots and Hungarian Jewish ancestry and was a devoted American patriot.”

Kelly Lee Curtis in 2012<br>Credit: Barry King/FilmMagic/Getty Images

The Halloween star went on to say that her sister will be remembered “for her loving generosity, fierce opinions, endless curiosity, unique style, and her powdered, almond, crescent cookies at Christmas, hence her name, Auntie Cookie.”

“Kelly always signed off any message or fare thee well with a Hungarian blessing … Isten Veled, God is with you. Isten Veled to my sister of the sun and the moon, my Tai. I’ll see you on down the line,” Jamie concluded.

PEOPLE has reached out to Jamie’s representative for comment.

Tony Curtis, Benjamin Curtis, Kelly Curtis, Nicholas Curtis, Allegra Curtis and Jamie Lee Curtis in 1989<br>Credit: Ron Galella, Ltd./Ron Galella Collection/Getty

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Kelly was the eldest of late actors Tony and Leigh’s two daughters, followed by Jamie. Tony had four other children: daughters Alexandra, 61, and Allegra, 59, with second wife Christine Kaufmann and sons Nicholas, who died aged 23 in 1994, and Benjamin, 53, with third wife, Leslie Allen.

Kelly was born in Santa Monica, Calif., and appeared alongside her parents in her first uncredited role in the 1958 movie The Vikings. She later starred alongside her sister Jamie in Trading Places (1983), per The Hollywood Reporter. 

Kelly continued acting and appeared in several TV shows throughout the 1980s and 1990s, including The Equalizer, Hunter, Silk Stalkings, Star Trek: Deep Space Nine and a recurring role on the first season of The Sentinel. She also worked as Jamie’s assistant on several of her films, per CBS News.

Kelly is survived by her husband, Scott Morfee.