Hollywood mourns the loss of actor Kelley Mack, known for her roles in The Walking Dead and Chicago Med, who passed away on August 2, 2025, at the age of 33 after battling diffuse midline glioma, a rare and aggressive brain cancer. Mack’s radiant talent and vibrant spirit left an indelible mark on her fans and the entertainment industry.
Remembering Kelley Mack’s Legacy
Kelley Mack, born Kelley Lynne Klebenow, captivated audiences as Addy in Season 9 of The Walking Dead and as Penelope Jacobs in Season 8 of Chicago Med. Her career also included numerous appearances in commercials and television programs, showcasing her versatility as an actor. Diagnosed with diffuse midline glioma, a rare form of astrocytoma that affects glial cells supporting the central nervous system, Mack faced her illness with courage. According to the Cleveland Clinic, gliomas typically develop in the brain but can also affect the spinal cord, making them particularly challenging to treat.
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Mack’s sister, Kathryn Klebenow, shared a heartfelt statement on Instagram: “It is with profound sadness that we announce the passing of our beloved Kelley. Such a radiant, passionate light has moved on to the beyond, a place we all must eventually go. Kelley passed peacefully on Saturday evening, with her devoted mother Kristen and dedicated aunt Karen by her side. She has already made her presence known to many of her loved ones in the form of butterflies. She will be deeply missed in ways words cannot capture.”
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Tributes and Memorial Plans
The family announced plans to honor Mack’s life with a recognition and remembrance event in Glendale, Ohio, on August 16, 2025, followed by a celebration of her life in Los Angeles at a later date. Mack is survived by her parents, her brother Parker, her sister Kathryn, and her grandparents. Her passing has prompted an outpouring of tributes from fans and colleagues, who remember her not only for her on-screen presence but also for her warmth and passion.
