Kelley Mack, a rising actress known for her role as Addy in The Walking Dead, has died at the age of 33. Her family confirmed that she passed away peacefully on Saturday, August 3, 2025, in her hometown of Cincinnati, Ohio, after bravely battling glioma, a form of cancer that affects the central nervous system.
The heartbreaking announcement was shared publicly through the health platform CaringBridge and later posted on Mack’s official Instagram on Tuesday, alongside a touching tribute.
A Battle with Glioma: Understanding the Cause
Kelley Mack, born Kelley Klebenow, had been fighting glioma, a rare and aggressive form of cancer that develops in the brain or spinal cord. Gliomas are especially difficult to treat and often affect motor functions, cognition, and vision depending on their location.
The family’s message shared that she “passed away peacefully” surrounded by loved ones. According to the American Cancer Society, gliomas account for about 3 out of 10 brain tumors and are known for their challenging treatment journey, often involving surgery, radiation, and chemotherapy.
A Community in Mourning: Tributes Pour In
After the news broke, tributes flooded social media from friends, co-stars, and fans around the world. A message posted to her Instagram read:
“It is with indelible sadness that we are announcing the passing of our dear Kelley. Such a bright, fervent light has transitioned to the beyond, where we all eventually must go.”
Alanna Masterson, who starred alongside Mack in The Walking Dead, shared her grief in a heartfelt post:
“What an incredible human. So proud to have fought alongside her in our final episode together.”
Other fans and peers described Mack as “radiant,” “talented,” “kind,” and “a creative soul who left a big mark in a short time.”
Breakthrough Role in The Walking Dead
Mack is best remembered for playing Addy, a member of the “Highwaymen” in Season 9 of The Walking Dead—one of television’s most popular post-apocalyptic dramas. The series, which aired on AMC, featured Mack in a gritty, emotionally intense role that won over fans.
In her short arc, Addy stood out as a tough yet compassionate survivor navigating a dangerous world filled with walkers and political conflict. Though not a leading character, Mack’s performance was praised for adding heart and realism to the storyline.
Career Highlights Across TV and Commercials
Kelley Mack had a wide-ranging career in television and commercial acting. Beyond The Walking Dead, she was known for:
- Penelope Jacobs in NBC’s Chicago Med (Season 8)
- A guest role on FOX’s 9-1-1, a procedural drama about first responders
- National commercial appearances for major brands such as:
- Dr. Pepper
- Dairy Queen
- Chick-fil-A
- Ross Dress for Less
In total, Mack held 35 acting credits and 5 producer credits, according to the statement on CaringBridge and verified by her IMDb profile.
Her commercial and voiceover work expanded her creative range and helped her connect with a broader audience. She had a natural screen presence, backed by technical knowledge of film production and a deep passion for storytelling.
Early Passion for Film and Storytelling
Kelley’s love for filmmaking began at a young age when she received a mini video camera as a birthday gift. That moment became a turning point in her life, inspiring her to explore both acting and directing.
She began her professional journey with child roles in television advertisements and slowly transitioned into more prominent parts in dramatic series.
Mack’s interest in visual storytelling wasn’t just limited to acting. She had a deep understanding of the technical side of filmmaking, which later led her to pursue formal education in the field.
Education and Film Training
Kelley Mack attended Hinsdale Central High School in Illinois, where she was known for participating in creative arts programs. Following high school, she enrolled at Chapman University’s Dodge College of Film and Media Arts in Orange, California.
She graduated with a Bachelor’s degree in Cinematography, a program that focuses on the visual elements of film production such as camera operation, lighting, and shot composition.
This background gave her an edge in both her performance and her understanding of the filmmaking process, making her a valued collaborator on set.
Known for Warmth, Creativity, and Dedication
Her family described Kelley as someone who brought warmth and light into every room she entered. According to the tribute posted on CaringBridge:
“Kelley was known for her warmth, creativity and unwavering support for those around her. Her infectious enthusiasm and dedication to her work inspired countless others in the industry and beyond.”
She was also known to mentor young creatives and offer encouragement to fellow actors navigating the competitive world of entertainment.
Loved Ones Left Behind
Kelley Mack is survived by a close and loving family:
- Parents: Kristen and Lindsay Klebenow
- Siblings: Sister Kathryn and brother Parker
- Grandparents: Lois and Larry Klebenow
- Boyfriend: Logan Lanier
The family has requested privacy during this difficult time but shared their gratitude for the overwhelming support and love they’ve received from fans and the entertainment community.
A Legacy of Passion, Kindness, and Talent
Though Kelley Mack’s life was tragically cut short, her legacy lives on through the stories she helped bring to life and the people she touched with her energy and dedication.
“Kelley’s legacy will live on through her contributions to film and television, and in the hearts of those who loved her,” the family said.
She will be remembered not only as a talented actress but also as a kind, passionate, and inspiring individual whose presence left an imprint on everyone she worked with.
Kelley Mack’s death is a huge loss to the entertainment world. Her career may have been brief, but the impact she made was meaningful. She showed what it meant to work with heart and purpose, and she inspired others to do the same.
As fans continue to revisit her performances and reflect on her legacy, her memory will live on in the characters she portrayed and the lives she touched.
