(WKBN) – Kelley Mack, an actress who appeared on shows including "The Walking Dead," "9-1-1," and "Chicago Med" has died, according to a message posted to her official Instagram account.

Mack died Saturday, according to her sister. She was 33.

"It is with indelible sadness that we are announcing the passing of our dear Kelley," reads the post, which included a photograph of Mack. "Such a bright, fervent light has transitioned to the beyond, where we all eventually must go."

Mack had suffered from glioma, a tumor that affected her central nervous system, according to a two-page announcement of her passing shared by family. There are several types of gliomas, according to the Cleveland Clinic; all types they are malignant, and usually grow in the brain or spinal cord.

Kelley and her fami

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