Actor Kelley Mack has died, her family announced Tuesday. She was 33.

Mack was best known for her role in The Walking Dead, where she played the character Addy in the show’s ninth season. She also appeared on Chicago Med, 9-1-1, and a handful of commercials, including ones for Dr. Pepper, Dairy Queen, and Chick-fil-A.

In a statement, Mack’s family said she had died Saturday “after battling glioma of the central nervous system.” In January, the actor said she’d been diagnosed with diffuse midline glioma, a rare form of cancerous brain tumor.

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Mack’s sister announced her death on the actor’s Instagram , saying she “passed peacefully” in Cincinnati with her mom and aunt by her side.

“It is with indelibl

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