By Vinod Ram 
Breaking News: Kelley Mack Dies at 33 After Brave Cancer Battle
Actress Kelley Mack, known for her appearance in post-apocalyptic zombie drama “The Walking Dead”, has died at age 33. The talented performer passed away on August 2, 2025, after a courageous battle with diffuse midline glioma, a rare form of brain cancer. TVLine reports that the actress died peacefully in her hometown of Cincinnati.
Kelley Mack Death: What Happened to The Walking Dead Actress?
The star announced in January she had been diagnosed with diffuse midline glioma, a rare form of cancer. Mack, who was born Kelley Klebenow, “passed away peacefully” in her hometown of Cincinnati on Saturday after battling glioma of the central nervous system.
The heartbreaking news was announced on her family’s social media accounts, where they described the actress as someone who brought “warmth, creativity, and unwavering support” to everyone around her. Fox News confirmed the news of her passing after the family’s announcement.
Kelley Mack Walking Dead Character: Who Did She Play?
Kelley Mack is best remembered for her role as Addy in Season 9 of AMC’s hit series “The Walking Dead” (2018-2019). She was best known for playing Addy in season 9 of the series The Walking Dead, where she portrayed a resident of the Hilltop Colony during a crucial period in the show’s storyline. The Hollywood Reporter confirmed her role as a Hilltop Colony resident.
The Walking Dead Season 9: Kelley Mack’s Impact
Her character Addy appeared during pivotal moments in The Walking Dead Season 9, contributing to the rich ensemble cast that made the series a global phenomenon. Despite limited screen time, Mack’s performance left a lasting impression on fans and cast members alike. You can learn more about The Walking Dead cast and episodes on AMC’s official website.
“What an incredible human,” Alanna Masterson, of “The Walking Dead,” wrote of Mack. “So proud to have fought alongside her in our final episode together”.
Kelley Mack TV Shows: Complete Filmography and Career Highlights
Kelley Mack Chicago Med Appearance
Beyond The Walking Dead, Kelley Mack appeared in Chicago Med Season 8, where she played the character Penelope Jacobs. Her guest appearance on the NBC medical drama showcased her versatility as an actress, transitioning seamlessly from post-apocalyptic horror to medical procedural drama.
Kelley Mack 9-1-1 Role
“The Walking Dead” and “9-1-1” actress Kelley Mack died on Friday after a battle with Glioma in the central nervous system. Her appearance on Fox’s emergency services drama “9-1-1” in 2019 further established her credentials as a reliable television actress capable of handling intense, action-packed storylines.
Complete Kelley Mack Filmography
Television Credits:
- The Walking Dead (2018-2019) as Addy
- Chicago Med (2022) as Penelope Jacobs
- 9-1-1 (2019) – Guest Role
- Unusual Suspects – Early career appearance
- Grayson: Earth One – Supporting role
Film Credits:
- Profile (2018) and Broadcast Signal Intrusion (2021)
- On The Black (Producer – horror feature)
- Universal (2025) – Final film project
- Wilda
- Manhattan
- Delicate Arch
Kelley Mack Early Life and Background
Mack, born Kelley Lynne Klebenow, was born in Cincinnati on July 10, 1992, and had two younger siblings, including actor Parker Mack. She began acting as a child, appearing in television commercials such as Dr. Pepper, Ross Stores, Dairy Queen, and Chick-fil-A.
Education and Career Beginnings
After graduating from Hinsdale Central High School in Illinois, she attended the Dodge College of Film and Media Arts at Chapman University, where she studied cinematography. This educational background influenced her later work as both an actress and producer.
Kelley Mack Cancer Battle: Diffuse Midline Glioma Diagnosis
What is Diffuse Midline Glioma?
Diffuse midline glioma is a rare and aggressive form of brain cancer that affects the central nervous system. A glioma is a type of tumor that affects the brain or spinal cord, and this particular type is known for its challenging treatment outcomes. The National Cancer Institute provides comprehensive information about brain tumor treatments.
Kelley Mack’s Brave Fight Against Cancer
The actress publicly shared her cancer diagnosis in January 2025, demonstrating remarkable courage and transparency with her fans throughout her battle. Even while fighting the disease, she continued promoting her work, including her final film “Universal,” showcasing her dedication to her craft until the end.
Kelley Mack Tributes: Industry Remembers Rising Star
Walking Dead Cast Remembers Kelley Mack
The news of Kelley Mack’s death prompted an outpouring of tributes from her Walking Dead family and other industry colleagues. She is remembered for her “infectious enthusiasm and dedication to her work” which “inspired countless others in the industry and beyond”. Legacy.com has created a memorial page where fans can share their condolences.
Social Media Tributes Pour In
Cast members and fans have taken to social media to share their memories of the talented actress, highlighting both her professional accomplishments and her warm personality off-screen.
Kelley Mack Net Worth and Career Achievements
While specific net worth figures aren’t publicly available, Kelley Mack built a respectable career across television, film, and commercial work. Her roles on high-profile shows like The Walking Dead, Chicago Med, and 9-1-1 established her as a recognizable face in television drama.
Legacy of Kelley Mack: Remembering a Talented Performer
Impact on The Walking Dead Universe
Kelley Mack’s contribution to The Walking Dead during Season 9 came at a crucial time in the series’ evolution. Her portrayal of Addy added depth to the Hilltop Colony storyline and demonstrated her ability to hold her own alongside the show’s established stars.
Inspiration for Young Actors
Her career trajectory from commercial work to major television appearances serves as inspiration for aspiring actors. She began acting in commercials at a young age, but realized a love for storytelling when she was given a mini video camera as a birthday gift.
Kelley Mack 2025: Final Projects and Posthumous Releases
The actress was actively promoting her 2025 film “Universal” in the months leading up to her passing, demonstrating her continued commitment to her craft even while battling illness. This dedication exemplifies the professionalism and passion that defined her career.
Remembering Kelley Mack’s Contributions to Television
Kelley Mack—the actress who appeared as Addy on season nine of The Walking Dead—died following a battle with a rare form of cancer. She was 33. Her passing represents a significant loss to the entertainment industry, cutting short a promising career that had already made meaningful contributions to beloved television series.
From her memorable appearance on The Walking Dead to her guest roles on Chicago Med and 9-1-1, Kelley Mack proved herself to be a versatile and dedicated performer. Her battle with glioma, faced with characteristic courage and openness, adds another dimension to her legacy as someone who inspired others both through her work and her personal strength.
The entertainment industry has lost a rising talent whose potential was just beginning to be fully realized. Kelley Mack’s performances will continue to be available to new audiences, ensuring that her talent and spirit live on through her artistic contributions to television and film.