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Kelley Mack: The Walking Dead Actress Dies at 33 After Cancer Battle By Our Arts Correspondent, London American actress Kelley Mack, widely known for her role in the hit series The Walking Dead and her extensive work across independent film and television, has died at the age of 33 following a diagnosis of a rare and aggressive form of cancer. Mack, whose full name was Kelley Lynne Klebenow, passed away peacefully on Saturday, 2 August 2025, at her family home in Cincinnati, Ohio, according to a statement released by her sister. The news has prompted an outpouring of tributes from colleagues and fans across the entertainment industry, mourning the loss of a talent described as a "bright, fervent light. " Mack’s passing followed a brief but intense battle with diffuse midline glioma (DMG), a highly aggressive and rare brain tumour that primarily affects the central nervous system. She had publicly shared her diagnosis in January of this year, detailing her sudden health decline which began with persistent back pain and nerve issues before the tumour was identified in her spinal cord. Her candid communication throughout her illness brought significant, albeit tragic, attention to the severity of DMG and the challenges faced by young adults fighting rare cancers. A Career Defined by Versatility Born in Cincinnati in 1992, Mack began her career at a young age, quickly establishing herself as a versatile performer, writer, and producer. She gained early recognition for her acting debut in the 2008 independent film The Elephant Garden, which secured her an Acting Award from Tisch School of the Arts and recognition at the Tribeca Film Festival. Her subsequent career in Hollywood saw her accumulate more than 35 acting credits across major television and film productions. She became best known for playing Addy, a resident of the Hilltop Colony, in Season 9 of AMC’s post-apocalyptic drama The Walking Dead between 2018 and 2019.
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Her television appearances also included guest roles on popular shows such as 9-1-1 and Chicago Med. Beyond on-screen work, Mack was involved in high-profile voice-over projects, notably acting as the voice match for Hailee Steinfeld's character, Gwen Stacy, in the Oscar-winning animated feature Spider-Man: Into the Spider-Verse. This breadth of work underscored a commitment not only to acting but to the entire creative process of filmmaking. The Public Health Battle Mack used her public platform to detail her experience with diffuse midline glioma, leveraging online blogs and social media to share the reality of her treatment, which included radiation therapy. Her diagnosis, which began after initial symptoms were mistaken for a slipped disc, highlighted the diagnostic difficulties associated with rare conditions. In a statement posted online earlier this year, she described the aggressive nature of the tumour and the partial loss of movement in her legs following spinal cord surgery. Dr. Eleanor Vance, a London-based medical analyst specialising in neuro-oncology, stated that Mack's public fight may prove to be a crucial legacy. "DMG is devastatingly rare, often affecting children and young adults, and its prognosis remains incredibly challenging. Kelley Mack’s transparency, despite the personal hardship, was invaluable.
It forced a conversation around early diagnostics for spinal and central nervous system tumours and provided much-needed visibility for patient advocacy groups working in this area," Dr. Vance told the BBC. Industry Reflection and Posthumous Work The response from the film and television community has reflected deep respect for her work ethic and artistic passion. Mack also held five producer credits, including co-writing and producing the critically acclaimed horror feature On The Black, which won the Jury Choice Award at the Atlanta Horror Film Festival. Mr. Alistair Finch, a long-time Los Angeles film producer and colleague, remarked on her dual roles behind and in front of the camera. "Kelley was an incredible force—she had the rare ability to excel both as an actor bringing a script to life, and as a creative executive ensuring the project succeeded. The emotional intelligence she brought to her craft, even when facing extraordinary personal challenges, was a testament to her dedication," Mr. Finch stated. Mack will have a final, posthumous appearance as an actress and executive producer in the forthcoming independent film Universal.
Weeks before her death, she had promoted the film's upcoming world premiere, expressing excitement about sharing the "small, down-to-earth film about huge, out-of-this-world concepts" with audiences. This final credit serves as a poignant reminder of her unwavering creative output. Memorial and Legacy Her family confirmed that the actress "passed away peacefully on Saturday evening with her loving mother Kristen and steadfast aunt Karen present. " A memorial service is scheduled to be held in Cincinnati, Ohio, with a further celebration of life planned for a later date in Los Angeles, the city where she lived and worked for over a decade. Kelley Mack is survived by her parents, Kristen and Lindsay Klebenow; her siblings, Kathryn and actor Parker Mack; her grandparents; and her boyfriend, Logan Lanier. The legacy of Kelly Mack, though tragically cut short, is cemented not only through her professional credits on screen but also through her quiet yet profound contribution to cancer awareness. The outpouring of global grief confirms her substantial impact on both the industry she cherished and the many lives she touched.
11 hours ago Kelley Mack, a film producer and actress who appeared in "The Walking Dead" and "Chicago Med," died after a brain cancer battle.
6 hours ago Actress Kelley Mack, known for her appearance in post-apocalyptic zombie drama “The Walking Dead,” has died. She was 33.
7 hours ago Kelley Mack yang dikenal melalui perannya sebagai Addy di serial The Walking Dead musim ke-9 mengembuskan napas terakhir di Cincinnati.
Kelley Mack (July 10, 1992 – August 2, 2025) was an American actress. [1] She is best known for playing Addy in season 9 of the series The Walking Dead (2018–2019).
4 hours ago Kelley Mack, known for her role in The Walking Dead, has died at the age of 33 following a battle with a rare form of cancer. The actress was recognised for her portrayal of.
4 hours ago Kelley Mack, who appeared in many TV shows including AMC's The Walking Dead, died after battling a type of tumor that affects the brain or spinal cord. She is remembered for.
6 hours ago Who was Kelley Mack? Actress and indie filmmaker passes away at 33. Known for her supporting roles in ‘The Walking Dead’ and ‘Chicago Med’, Mack was suffering from a rare.
6 hours ago The Walking Dead and Chicago Med actress Kelley Mack has died aged 33 after being diagnosed with glioma of the central nervous system.
13 hours ago Kelley Mack, who played Hilltop Colony resident Addy on The Walking Dead, has died after a battle with glioma of the central nervous system at 33.
14 hours ago ACTRESS Kelley Mack has died at the age of 33 after a battle with cancer. The star is best known for her role as Addy in season nine of popular the AMC zombie series The.
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