Actress Kelley Mack, who played Addy on Season 9 of The Walking Dead , has died at age 33.

According to an online obituary, Mack, who was born Kelley Klebenow, died on Aug. 2, after battling glioma of the central nervous system.

Mack’s family also shared the news in a post shared to her official Instagram page this week.

“It is with indelible sadness that we are announcing the passing of our dear Kelley. Such a bright, fervent light has transitioned to the beyond, where we all eventually must go,” read a messaged shared with Mack’s more than 14,500 followers .

According to the Cleveland Clinic , glioma is a cancerous tumour that forms in the brain or spinal cord.

In addition to her work on , Mack played Penelope Jacobs in Season 8 of NBC’s Chicago Med and booked a role on

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