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Most people met Kelley Mack the way you meet a good guest actor: she had a few scenes, made an impression, and you moved on. Then, on August 2, 2025, she died at 33, and the reason made the loss land differently. Her family told The New York Times (obituary report) that a tumor affecting her central nervous system was the cause, and TODAY (health coverage) later identified the illness as diffuse midline glioma. This is the story behind the diagnosis — and the roles that brought her to your screen.

Age at death: 33 (The New York Times)