August 6, 2025 — The entertainment world is mourning the loss of Kelley Mack, a gifted actress known for her compelling performances on The Walking Dead, Chicago Med, and numerous other projects. She passed away on August 2, 2025, at the age of 33, after a courageous fight against a rare and aggressive form of cancer—a diffuse midline glioma affecting her central nervous system.

From Early Passion to Screen Success

Born Kelley Lynne Klebenow on July 10, 1992, in Cincinnati, Ohio, Kelley was introduced to storytelling at a young age. A gifted video camera inspired her to begin acting in commercials for brands like Dr. Pepper, Dairy Queen, and Chick-fil-A.. After graduating from Chapman University with a degree in cinematography, she embarked on a dynamic career that spanned 35 acting credits and five producer roles.

Notable Roles and Creative Ventures

Kelley captured audiences’ hearts with key roles including Addy in Season 9 of The Walking Dead, Penelope Jacobs in Chicago Med, and guest spots in 9‑1‑1. She also appeared in films like Broadcast Signal Intrusion (2021) and Delicate Arch, and most recently starred in the yet-to-be-released Universal. Additionally, she produced short films—the most acclaimed being A Knock at the Door, which earned recognition at the Atlanta Horror Film Festival in 2022.

A Brave Public Battle with Cancer

In late 2024, Kelley began experiencing debilitating lower back pain and sharp leg sensations. In January 2025, she received the devastating diagnosis: diffuse midline glioma, a rare and aggressive brain tumor. After undergoing spinal cord biopsy and treatments, she lost the use of most of her legs, relying on a walker and wheelchair—but she continued to share her journey publicly, inspiring many.

A Peaceful Farewell and Heartfelt Tributes

Kelley passed away peacefully in Cincinnati on August 2, surrounded by her mother and aunt. Her sister Kathryn shared an emotional tribute via Instagram:

“Such a bright, fervent light has transitioned to the beyond… Kelley will be missed by so many… she was so brave.”

Fans and colleagues remembered her warmth, creativity, and unwavering passion for storytelling. Butterflies have become a symbolic presence to loved ones following her passing—a beautiful reminder of her enduring spirit.

Celebrations of Her Life

A celebration of life is scheduled for August 16 in Glendale, Ohio, with a future memorial planned in Los Angeles to connect with her Hollywood peers