BOSTON — Tatiana Schlossberg, a vibrant advocate for the environment and granddaughter of the late President John F. Kennedy, has passed away at the youthful age of 35. Known for her impactful environmental journalism, Schlossberg revealed her advanced stage of cancer in an essay published in The New Yorker in November 2025, sparking a conversation about health, environmental policies, and personal resilience.

Diagnosed with acute myeloid leukemia just after her second child’s birth in May 2024, she underwent extensive treatment, including chemotherapy and stem cell transplants. Her family's statement shared on social media confirmed her demise, praising her enduring spirit: “Our beautiful Tatiana passed away this morning. She will always be in our hearts.”

In her poignant essay, titled 'A Battle With My Blood', Schlossberg detailed her ongoing fight against the illness and expressed fears concerning her children’s remembrance of her. Alongside her personal struggles, she boldly critiqued the health policies advocated by her cousin, Robert F. Kennedy Jr., asserting that they jeopardized the chances of patients like herself, particularly concerning funding for mRNA vaccine research, which has potential applications in cancer treatment.

An accomplished journalist, Schlossberg contributed to The New York Times' Science section, earning accolades for her book 'Inconspicuous Consumption', which received the Rachel Carson Environment Book Award in 2020. As the world mourns the loss of a passionate environmental steward, her legacy as an advocate for the marriage of health and environmental issues remains poignant, resonating deeply within and beyond her family.