Actress Kelley Mack, best known for her roles on “The Walking Dead” and “Chicago Med,” has died at age 33 after a seven-month battle with an aggressive form of cancer.

In January, the rising star was diagnosed with diffuse midline glioma, a fast-growing tumor that attacks the central nervous system. The illness surfaced just months after she began experiencing pain she believed was from a simple back injury.

Mack, born Kelley Klebenow, “passed peacefully” on August 2 in her hometown of Cincinnati, Ohio, with her mother and aunt by her side, her sister shared in an Instagram post on Tuesday. 5

Gliomas are considered rare, with just six cases diagnosed per 100,000 people each year in the US.

Still, they are the most common type of tumor that begins in the brain or spinal cord,

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