Actress Kelley Mack, best known for playing Addy in The Walking Dead and appearing on Chicago Med and 9-1-1, passed away on August 2, 2025, at just 33 years old. She died peacefully in her hometown of Cincinnati, surrounded by family.
Her death followed a battle with diffuse midline glioma (DMG), a rare and aggressive brain tumor that typically affects children but can also occur in adults. This type of tumor grows in critical parts of the brain or spinal cord and spreads into healthy tissue, making it difficult to treat.
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