Kelley Mack, known for her role in The Walking Dead, died at age 33 following complications from a rare brain cancer, prompting tributes across the film and television community.
At a Glance
- Kelley Mack died on August 2, 2025, in Cincinnati, Ohio
- She had been diagnosed with diffuse midline glioma in late 2024
- Mack appeared in The Walking Dead, 9‑1‑1, and Chicago Med
- She documented her health struggles publicly on social media
- A celebration of life is scheduled for August 16 in Ohio
Career Highlights
Kelley Mack began acting in the early 2010s and gained national attention for her role as Addy in Season 9 of The Walking Dead. She also had recurring or guest roles on series such as Chicago Med and 9‑1‑1. Over her career, she earned 35 acting credits and five producer credits, including the upcoming film Universal, which she also executive produced.
Born Kelley Lynne Klebenow on July 10, 1992, she was raised in Cincinnati and later earned a cinematography degree from Chapman University. Her versatility across acting, writing, and production made her a multifaceted presence in independent film.
Watch now: ‘The Walking Dead’ actress Kelley Mack dies at 33 · YouTube
Health Battle and Public Disclosure
Mack was diagnosed with diffuse midline glioma, a rare and aggressive brain and spinal cord tumor, in late 2024. Initial symptoms included persistent lower back pain and nerve issues, which were initially misdiagnosed as orthopedic problems. A spinal cord biopsy later confirmed the cancer, and complications from the procedure reduced her mobility.
Throughout 2025, Mack posted openly about her condition, including videos of her rehabilitation efforts. She shared footage of herself relearning to walk and undergoing physical therapy, which drew support and admiration from fans and advocacy groups. Her openness brought attention to symptoms of rare neurological diseases often missed in early stages.
Personal Legacy and Memorial
Mack passed away peacefully on August 2, 2025, with her mother and aunt by her side. Her sister Kathryn confirmed the news on social media, describing Kelley as a “bright, fervent light” and noting symbolic encounters with butterflies among family members after her death. A public celebration of life is planned for August 16 in Ohio.
Tributes from fellow actors, producers, and fans highlighted Mack’s courage, warmth, and creative spirit. Her story has since been cited by medical advocacy organizations seeking to improve awareness around diffuse midline glioma and other under-recognized conditions.
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