Tragic Loss of The Walking Dead Star: Kelley Mack Dies at 33 from Rare Brain Tumor.
Kelley Mack, beloved for her role as Addy in Season 9 of The Walking Dead, passed away on Saturday, August 2, 2025, in her hometown of Cincinnati, Ohio, at the age of 33. The actress succumbed to diffuse midline glioma, a rare and aggressive brain tumor that she had been battling since her diagnosis earlier this year. Her death has left fans and colleagues heartbroken, with tributes pouring in to celebrate her talent and resilience. Here’s a look at Mack’s life, her courageous fight, and the legacy she leaves behind.
A Rising Star’s Journey
Born Kelley Klebenow, Mack made a lasting impression in the entertainment world with her role as Addy in The Walking Dead, a hit series that brought her widespread recognition. Her talent extended beyond the zombie apocalypse drama, with appearances in Chicago Med and independent films like Mr. Manhattan, Broadcast Signal Intrusion, and Delicate Arch. Known for her versatility and warmth, Mack quickly became a favorite among peers and audiences alike.
Her career, though cut short, showcased her ability to bring depth to diverse roles. From intense dramas to smaller indie projects, Mack’s performances were marked by authenticity and passion, earning her respect in the industry. Her agent, Julie Smith, confirmed her passing, noting that Mack faced her illness with remarkable courage despite its devastating effects.
A Brave Battle Against Cancer
Mack’s diagnosis of diffuse midline glioma, a rare cancer affecting the central nervous system, was made public in January 2025. The aggressive tumor left her partially paralyzed, presenting immense physical and emotional challenges. Yet, Mack remained optimistic, sharing updates on social media to inspire others. In March, she posted a moving video of herself climbing stairs a significant milestone in her treatment journey demonstrating her determination to fight the disease.
Her openness about her condition resonated with fans, who admired her strength and positivity. Despite the tumor’s severity, Mack’s updates offered hope, reflecting her unwavering spirit. Her battle, though brief, highlighted her resilience and inspired those following her journey on platforms like Instagram and X.
Heartfelt Tributes from Loved Ones
Mack’s sister announced her passing on Instagram, sharing a touching message: “Kelley passed peacefully on Saturday evening with her loving mother Kristen and steadfast aunt Karen present.” The post captured the love and support surrounding Mack in her final moments, emphasizing the close-knit family she cherished. The announcement prompted an outpouring of grief and admiration from fans and colleagues.
The Walking Dead co-stars and crew members paid tribute to Mack’s vibrant personality. Director Michael E. Satrazemis described her as “a bright light on every level,” while others called her an “incredible human” whose warmth touched everyone she met. The tributes, shared widely on social media, reflect the profound impact Mack had on those around her, both personally and professionally.
A Lasting Legacy
A remembrance service for Mack is scheduled for August 16, 2025, in Ohio, where friends, family, and fans will gather to honor her memory. Her legacy lives on through her memorable performances and the inspiration she provided during her illness. Mack’s courage in facing a rare and aggressive cancer has sparked conversations about the need for research into lesser-known diseases, with many fans advocating for awareness in her honor.
As the entertainment world mourns, Kelley Mack’s story serves as a reminder of the fragility of life and the power of resilience. Her light may have dimmed, but her impact will continue to shine through the lives she touched.
