Some actors manage to leave an imprint that lingers far beyond the closing credits. Kelley Mack, cherished by many as Addy from AMC’s The Walking Dead, was one of those rare talents. On August 2, 2025, she passed away at the age of 33 after a private battle with glioma of the central nervous system, a rare and aggressive brain cancer.
Her passing has deeply moved fans, colleagues, and the entertainment community—not only because her life ended far too soon, but because of the warmth, humor, and creativity she brought to every project.
A Quiet but Courageous Fight
Few knew of Kelley’s illness. Behind the scenes, she faced a diagnosis that would test anyone’s resilience. Gliomas are tumors of the brain or spinal cord, often progressing silently until symptoms become severe.
Friends and family describe her as “courageous and full of grace”, facing treatment and uncertainty with determination that inspired those around her.
From Missouri Roots to Hollywood Lights
Born in St. Louis, Missouri, Kelley’s love for storytelling blossomed early. She honed her craft at Chapman University in California, studying Cinematography and Film/Video Production.
Her career grew steadily—built on auditions, independent projects, and behind-the-camera work. Kelley’s commitment to learning every side of the industry made her a versatile and respected figure in creative circles.
Roles That Resonated
Though best known for her role as Addy in Season 9 of The Walking Dead, Kelley also made her mark in:
- Chicago Med – Delivering heartfelt performances in high-stakes scenes.
- 9-1-1 – Bringing intensity and authenticity to fast-paced drama.
She also explored:
- Independent films – Partnering with passionate storytellers.
- Voice work – Adding personality to commercials and animations.
- Producing – Giving a platform to stories she believed in.
Addy’s Legacy in The Walking Dead
Addy wasn’t a central character, but she embodied loyalty and bravery. As part of the Hilltop Colony during the Whisperer conflict, she became a quiet fan favorite.
Clips of her moments are now resurfacing online, a testament to how even smaller roles can leave lasting impressions.
A Spotlight on Glioma Awareness
Kelley’s story has helped raise awareness for glioma and other brain cancers that often go unnoticed until advanced stages. Recognizing symptoms like chronic headaches, vision changes, or balance issues can be vital for early detection.
Tributes That Speak Volumes
After her death, social media filled with tributes:
- Co-stars remembered her generosity and humor.
- Fans shared art, scene compilations, and messages of gratitude.
Her legacy, it seems, is measured not by screen time but by the genuine connections she made.
Honoring Her Life
A Celebration of Life will be held in Los Angeles, with donations encouraged to brain cancer research—a cause that now carries her name and memory.
Remembering Kelley Mack
Kelley Mack’s career and life are reminders that success is about passion, perseverance, and the ability to inspire. Her performances will be revisited with fresh meaning, and her influence will live on in the work and hearts she touched.
Frequently Asked Questions
Who was Kelley Mack?
An American actress best known for her role as Addy in The Walking Dead, as well as her work as a producer and voice artist.
What role did she play on The Walking Dead?
Addy, a Hilltop Colony resident during the show’s ninth season.
When did Kelley Mack pass away and why?
On August 2, 2025, at age 33, due to glioma of the central nervous system.
What other projects was she involved in?
Chicago Med, 9-1-1, indie films, voice work, and producing.
