Environmental journalist Tatiana Schlossberg, one of three grandchildren of the late President John F. Kennedy, has died after she was diagnosed with leukemia last year. She was 35.

Schlossberg, daughter of Kennedy’s daughter, Caroline Kennedy, and Edwin Schlossberg, revealed she had terminal cancer in a November 2025 essay in The New Yorker. A family statement disclosing her death was posted on social media Tuesday by the John F. Kennedy Library Foundation.

“Our beautiful Tatiana passed away this morning. She will always be in our hearts,” the statement said. It did not disclose a cause of death or say where she had died.

Maria Shriver, a niece of John F. Kennedy and a former award-winning TV journalist, grieved for Schlossberg on social media and called her “the light, the humor, the joy” and a great journalist who “used her words to educate others about the earth and how to save it.”

“She loved her life, and she fought like hell to try to save it,” Shriver wrote.

Schlossberg told of being diagnosed with acute myeloid leukemia in May 2024 at 34. While in the hospital for the birth of her second child, her doctor noticed her white blood cell count was high. It turned out to be acute myeloid leukemia with a rare mutation, mostly seen in older people.

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In the November essay, “A Battle With My Blood,” Schlossberg recounted going through rounds of chemotherapy and two stem cell transplants and participating in clinical trials. During the most recent trial, she wrote, her doctor told her “he could keep me alive for a year, maybe.”

Tatiana Schlossberg, daughter of Caroline Kennedy, ambassador of the United States to Australia, addresses the audience during the John F. Kennedy Profile in Courage Award ceremony, Sunday, Oct. 29, 2023, at the John F. Kennedy Presidential Library and Museum, in Boston. (AP Photo/Steven Senne, File)

Schlossberg also criticized policies pushed by her mother’s cousin, Health and Human Services Secretary Robert F. Kennedy Jr., in the essay, saying policies he backed could hurt cancer patients like her. Her mother had urged senators to reject his confirmation.

“As I spent more and more of my life under the care of doctors, nurses, and researchers striving to improve the lives of others, I watched as Bobby cut nearly a half billion dollars for research into mRNA vaccines, technology that could be used against certain cancers,” the essay reads.

Schlossberg had worked as a reporter covering climate change and the environment for The New York Times’ Science section. Her 2019 book “Inconspicuous Consumption: The Environmental Impact You Don’t Know You Have” won the Society of Environmental Journalists’ Rachel Carson Environment Book Award in 2020.

Schlossberg wrote in The New Yorker essay that she feared her daughter and son wouldn’t remember her. She felt cheated and sad that she wouldn’t get to keep living “the wonderful life” she had with her husband, George Moran.

While her parents and two siblings tried to hide their pain from her, she said she felt it every day. Her siblings, Rose and Jack Schlossberg, are JFK’s other grandchildren.

“For my whole life, I have tried to be good, to be a good student and a good sister and a good daughter, and to protect my mother and never make her upset or angry,” she said. “Now I have added a new tragedy to her life, to our family’s life, and there’s nothing I can do to stop it.”

Tatiana Schlossberg, second right, granddaughter of President J.F. Kennedy pauses for a moment of silence during a short ceremony at the JFK memorial Runnymede, England, Friday, Nov. 22, 2013. (AP Photo/Alastair Grant, File)

Schlossberg’s mother Caroline was 5 years old when her father, President Kennedy, was assassinated in Dallas in 1963. She was 10 when her uncle, Robert F. Kennedy, was assassinated in Los Angeles in 1968 while he was running for president.

Caroline’s brother, John F. Kennedy Jr., died in 1999 when the single-engine plane he was piloting plunged into the Atlantic Ocean, near Martha’s Vineyard, Massachusetts. His wife, Carolyn, and her sister, Lauren Bessette, also died in the crash.

Shriver called Schlossberg valiant, strong and courageous.

“She was smart, wicked smart, as they say, and sassy. She was fun, funny loving, caring, a perfect daughter, sister, mother, cousin, niece, friend, all of it,” Shriver wrote.

Levy reported from Harrisburg, Pennsylvania, and Brumfield from Cockeysville, Maryland.