Kelley Mack arrives at the friends and family premiere of “Broadcast Signal Intrusion” at iPic Theaters on Oct. 19, 2021, in Los Angeles.

Kelley Mack, a film producer and actress who appeared in “The Walking Dead” and “Chicago Med,” has died. She was 33.

Born Kelley Lynne Klebenow, the Chapman University graduate died Aug. 2 in her hometown of Cincinnati following a battle with glioma of the central nervous system. Her agent, Julie Smith, confirmed the news to USA TODAY on Aug. 5.

According to the National Cancer Institute, gliomas are groups of tumors formed from abnormal glial cells, which “support and protect the brain’s nerve cells” and are found in the brain and spinal cord. They are “the most common type of malignant primary brain tumor in adults,” per the NCI.

Though Mack also did work on commercials and short films, her biggest roles saw her on screen on Season 8 of “Chicago Med” as Penelope Jacobs. She also played Addy in Season 9 of “The Walking Dead.”

Mack’s sister, Kathryn Klebenow, shared news of her death on her Instagram, writing in the caption that “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.”

She “passed peacefully on Saturday evening with her loving mother Kristen and steadfast aunt Karen present,” per the post. Klebenow added, “As her sister, I want you all to know how brave … (she) was, especially when she decided to make the leap to be reunited with God. I’m so … proud of her.”

Previously, Mack’s family shared in April that she had completed proton radiation treatment.

In a statement shared on Mack’s CaringBridge page, Klebenow wrote that her family will be holding “a recognition and remembrance of Kelley’s life” in Glendale, Ohio, on Aug. 16, with a celebration of life planned for an unspecified date in Los Angeles.

This article originally appeared on USA TODAY: Kelley Mack dies: ‘The Walking Dead’ actress dead at 33