The Tragic Story Of Kelley Mack: 5 Key Facts About The Walking Dead Actress's Death And Battle With Rare Cancer

The tragic news surrounding the death of actress Kelley Mack, known for her role in AMC’s *The Walking Dead*, has sparked widespread confusion online, with many searches incorrectly suggesting she was "killed." As of this update in December 2025, the truth is a heartbreaking story of a fierce, but ultimately lost, battle with a rare and aggressive form of cancer. Mack, a rising star in Hollywood, passed away far too soon at the age of 33, leaving behind a legacy that spanned television, film, and acclaimed voiceover work.

This article aims to clarify the circumstances of her passing, provide a complete profile of her impressive career, and detail her courageous fight against the devastating disease known as Diffuse Midline Glioma (DMG). Her story is one of immense talent and resilience in the face of an impossible diagnosis, offering a poignant reminder of her impact on the entertainment industry.

Kelley Mack: A Complete Biography and Filmography

Kelley Mack was an American actress, writer, and voiceover artist whose career was marked by versatility and a commitment to her craft. Her full name was Kelley Lynne Klebenow.

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• Full Name: Kelley Lynne Klebenow
• Professional Name: Kelley Mack
• Date of Birth: July 10, 1992
• Place of Birth: Cincinnati, Ohio, U.S.
• Date of Death: August 2, 2024
• Age at Death: 33 years old
• Cause of Death: Diffuse Midline Glioma (DMG) / Glioma of the Central Nervous System
• Parents: Born to a businessman and a real estate agent.

Notable Career Roles and Filmography

Mack’s career was diverse, showcasing her abilities both in front of the camera and in the recording booth. Her most recognizable television role came from one of the biggest shows in the world.

Television Roles (Entities)

• The Walking Dead (2018–2019): She is best known for her recurring role as Addy, a key survivor from the Hilltop Colony, appearing in five episodes of Season 9 of the AMC series.
• Chicago Med: Mack also appeared on the popular NBC medical drama, further cementing her presence in television.
• Coventry (2018): She played the role of Morgan in this four-episode TV mini-series.
• The Kingdom (2014): An early television credit.

Film and Voiceover Work (Entities)

Beyond her on-screen appearances, Kelley Mack was an accomplished voiceover artist and producer, with one of her most notable contributions being to an Oscar-winning animated feature.

• Spider-Man: Into the Spider-Verse: Mack served as the crucial voice match and voice double for Hailee Steinfeld’s character, Gwen Stacy (also known as Spider-Woman), in the critically acclaimed film.
• Broadcast Signal Intrusion (2021): A feature film credit.
• Profile (2018): Another feature film appearance.
• The Elephant Garden: Her very first film role, which was an award-winning short film.

The Truth Behind the 'Killed' Keyword: Kelley Mack's Battle with Diffuse Midline Glioma (DMG)

The search query "tv actress kelly mack killed" is a tragic misinterpretation of the actual events. Kelley Mack was not the victim of a crime, but rather a victim of a devastating, rare, and aggressive brain tumor.

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In January 2024, Mack received the shocking diagnosis of Diffuse Midline Glioma (DMG), a highly malignant tumor that affects the central nervous system, often in the brain or spinal cord. This form of cancer is particularly aggressive and is more commonly diagnosed in children and young adults, making her battle all the more challenging.

Despite the grim prognosis, the actress and her family, including her mother Kristen, fought the disease with immense courage. She underwent various treatments in an attempt to combat the rapid progression of the tumor. The news of her diagnosis was shared with the public via a CaringBridge statement and her family’s social media.

Her passing on August 2, 2024, in Cincinnati, Ohio, was described by her family as peaceful, occurring after she took a sudden turn for the worse. The term 'killed' is often used in headlines to describe a death from a sudden, fatal illness, but in Mack’s case, it refers to the swift and brutal nature of the glioma, which ultimately took her life despite her brave fight.

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A Legacy Beyond the Screen: Voice Work and Unfinished Projects

Kelley Mack’s creative ambition extended beyond acting, ensuring her legacy includes her work as a writer and producer. Her ability to transition between on-screen performance and intricate voice work highlighted her multifaceted talent, making her a true Hollywood professional.

The Acclaimed Voice Match

One of her most significant, yet often uncredited, contributions was her work on the Oscar-winning animated film, *Spider-Man: Into the Spider-Verse*. Her role as a voice double required her to perfectly match the voice and cadence of star Hailee Steinfeld for the character of Gwen Stacy. This highly specialized skill is a testament to her vocal control and technical ability as a performer, playing a crucial, though behind-the-scenes, part in the film's success.

Writing and Producing Endeavors

Mack was also actively working on her own creative projects, co-writing two feature films with her mother, Kristen. These projects demonstrate her passion for storytelling and her desire to move into the production side of the industry.

• Welcome to Morrow: Described as a dark comedy/fantasy feature film.
• On the Black: A drama feature film.

At the time of her death, both films were in the active packaging stage, representing the immense potential of her unfinished work. Her early success in producing was evident when her first short film, *The Elephant Garden*, received an award, signaling a promising career as a filmmaker.

Tributes and The Enduring Memory of Kelley Mack

The death of the talented actress led to an outpouring of tributes from her co-stars, colleagues, and the wider entertainment community. Her passing was deeply felt by the cast and crew of *The Walking Dead*, where she played the Hilltop Colony survivor, Addy.

Kelley Mack’s life, though tragically cut short by diffuse midline glioma, was a vibrant display of artistic dedication. She was an actress, a voiceover artist, a producer, and a writer. Her struggle with the rare cancer has brought increased attention to DMG, a disease that desperately needs more research and awareness. Her memory lives on through her compelling performances in projects like *The Walking Dead* and her vital, hidden contribution to the Oscar-winning *Spider-Man* film.

In clarifying the misleading online narrative, we honor the truth of Kelley Mack's life—a life of profound talent and a courageous, private battle against a relentless illness.