Actress Kelley Mack of "The Walking Dead," "9-1-1" and "Chicago Med" has died.

Mack died Saturday, according to her sister. She was 33, reports KTLA sister station WKBN.

"It is with indelible sadness that we are announcing the passing of our dear Kelley," a post on her official Instagram reads alongside a photo of her. "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 family had also been documenting her treatments, which included su

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