Kelley Mack in Walking Dead is making headlines as fans and colleagues honor her memory following the actress’s recent passing at age 33. Mack, best known for her role as Addy on AMC’s “The Walking Dead” in season 9, died from glioma of the central nervous system on August 2, 2025, in Cincinnati, Ohio.
News of Kelley Mack’s passing was confirmed by her agent and family on August 5, sending a wave of shock and sorrow through the entertainment community. Only seven months before her death, Mack had begun her battle with a rare form of brain cancer called astrocytoma. She kept supporters updated via social media, sharing her journey through treatment, including her resilience in relearning basic skills. Her family announced her death, remembering her as “a bright, brilliant light who transitioned to the beyond, where we all eventually must go”. A celebration of her life will take place on August 16 in Glendale, Ohio. An additional service is planned in Los Angeles for her friends and film industry peers.
Kelley Mack’s Performance as Addy
Mack’s portrayal of Addy—one of the Hilltop Colony’s residents—left a mark on “The Walking Dead” fandom. Addy appeared during a pivotal arc in season 9 and became one of the show’s memorable casualties when her character was killed in the infamous “pike border” scene orchestrated by Alpha. Mack herself reflected on the experience in interviews, stating that being part of the beloved series was a dream and opened new doors for her career. She praised the camaraderie and professionalism of the “Walking Dead” cast and crew, highlighting the family-like atmosphere on set.
Career Highlights and Achievements
While “The Walking Dead” brought Mack into the spotlight, her talent extended far beyond. Her notable credits included Penelope Jacobs in “Chicago Med,” Alice in “Broadcast Signal Intrusion,” and voice work in the Oscar-winning animated film “Spider-Man: Into the Spider-Verse.” Mack earned awards early in her career, including recognition from NYU’s Tisch School of the Arts and winning the Student Visionary Award at the Tribeca Film Festival for her role in “The Elephant Garden”. In June 2025, she made an appearance at Dances with Films, joining the cast of “Universal”—a film she also helped produce.
Mack’s passion for filmmaking led her to co-write several scripts and serve as an executive producer. She thrived creatively, balancing her love for performance with a commitment to the craft of storytelling. She was known not only for her acting but also for her contributions behind the scenes, earning respect from industry colleagues and aspiring filmmakers alike.
Personal Life and Legacy
Born Kelley Lynne Klebenow, Mack grew up in Ohio before moving to California to further her career. Family was central to her life—her brother Parker Mack is also an actor—and she often pursued projects and hobbies with her loved ones. She enjoyed tennis, hiking, and supporting animal causes. Mack’s warmth, wit, and drive to make a difference left lasting impressions on those who knew her and audiences worldwide.
The Role of Addy: Why Fans Remember
- Addy stood out for kindness and loyalty, resonating with viewers who connected with her spirit.
- Her tragic exit was one of the show’s most visceral moments, marking a turning point for “The Walking Dead” in season 9.
- Mack’s fans continue sharing memories and tributes on forums and social media, celebrating both her talent and authentic kindness.
As new generations discover “The Walking Dead,” Kelley Mack’s work as Addy lives on, cementing her as a valued part of the series’ rich legacy. Her artistry and courage, both onscreen and off, ensure she will not be forgotten.
Have you rewatched Addy’s journey in “The Walking Dead”? Share your thoughts and favorite Kelley Mack moments in the comments—let’s celebrate the impact she made together.
