TEMPLE, Texas — Actress Kelley Mack, best known for her roles on "The Walking Dead" and "Chicago Med," died Saturday at 33 years old after a lengthy battle with a rare disease.

Mack's family reports she died "peacefully" after enduring midline glioma of the central nervous system. The news comes months after Mack, born Kelley Klebenow, revealed she had been diagnosed with diffuse midline glioma in January. According to the National Cancer Institute, diffuse midline glioma refers to a cancerous brain tumor that typically begins in the brain or spinal cord.

What are the symptoms of diffuse midline glioma?

The NCI states symptoms are dependent on the tumor's location. Possible symptoms that can happen are:

double vision

problems swallowing

weakness on one or both sides of the body

lo

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