Kelley Mack Death: ‘Walking Dead’ and ‘Chicago Med’ Actress Dies at 33

Kelley Mack, the actress remembered fondly for her role as Addy on AMC’s celebrated series The Walking Dead and her appearances on Chicago Med, has died at the age of 33. 

Her passing on August 2, 2025, in her hometown of Cincinnati marked a heartbreaking loss for both the entertainment community and her many admirers. 

Known off-screen as Kelley Lynne Klebenow, she fought a brave battle against glioma, a rare and aggressive tumor affecting the brain and spinal cord. 

Her family shared the news with profound sorrow, highlighting not only her talent but also her warmth, creativity, and the infectious enthusiasm that inspired those around her.

Kelley Mack’s Career Highlights and Impact

Mack’s acting journey began in childhood, evolving into a career that spanned over three dozen credits across television and film. She gained widespread recognition from her role as Addy in season nine of The Walking Dead, a series known for its gripping post-apocalyptic narrative and devoted fan base. 

Beyond this, she appeared in other popular TV shows including Chicago Med and FOX’s 9-1-1, showcasing her versatility across genres. Alongside television, Mack’s film work included several shorts and independent projects, and she also ventured into producing, contributing to five credited productions.

Her performances were marked by dedication and depth, earning her respect in a competitive industry. Colleagues and fans alike remember her not only for her on-screen presence but for the kindness and vibrant spirit she brought to every role and interaction. 

This legacy of passion extended beyond acting into her collaboration with family members on screenwriting projects, a testament to her creative drive.

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The Battle with Glioma and Final Days

Kelley Mack was diagnosed with glioma, a type of tumor that affects the central nervous system—a diagnosis that profoundly impacted her life and work. Her health struggles began in late 2024, marked initially by persistent pain and neurological symptoms that led to an MRI revealing an abnormal mass in her spinal cord. 

Despite surgery and rigorous treatments, Mack experienced significant physical challenges, including loss of mobility in her legs. Throughout this difficult period, she remained courageous and transparent with her followers, sharing moments from her recovery and the emotional ups and downs of her journey.

Her family confirmed she passed away peacefully on August 2, surrounded by loved ones including her mother Kristen and her aunt Karen. Tributes have poured in, celebrating her bravery, warmth, and the profound mark she left on the hearts of many. 

Plans for a remembrance service in Ohio on August 16 have been announced, along with a future celebration of her life in Los Angeles, where she lived and worked for over a decade.

Remembering Kelley Mack: A Tribute to Her Legacy

In the wake of her passing, those who knew Kelley Mack emphasize her enduring legacy of kindness and passion. 

Her sister’s heartfelt Instagram tribute conveyed the depth of loss and admiration for Mack’s fierce spirit and dedication, especially highlighting her choice to find peace through faith. Friends and colleagues remember her as a “bright, fervent light” whose contributions to storytelling and her genuine care for others set her apart in a demanding industry.

Kelley Mack’s influence continues through the characters she portrayed, the stories she helped tell, and the inspiration she offered to those facing their own battles. Her life, though tragically cut short, remains a testament to resilience, creativity, and humanity—a legacy cherished by family, fans, and the entertainment world alike.

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Conclusion: A Life Celebrated and Remembered

The passing of Kelley Mack is a solemn moment to reflect on a vibrant life dedicated to her craft, creativity, and community. Through her roles on The Walking Dead, Chicago Med, and beyond, she left an indelible mark on audiences and peers. 

Her battle with glioma and her courage throughout it serve as a poignant reminder of fragility and strength intertwined. As family and fans honor her memory, Kelley Mack's spirit shines on—a beacon of talent and kindness that will continue to inspire.

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FAQ

Who was Kelley Mack?

Kelley Mack was an American actress known for her role as Addy in season nine of The Walking Dead and appearances in Chicago Med and 9-1-1. She also worked as a producer and screenwriter.

What caused Kelley Mack’s death?

She died from glioma, a rare and aggressive tumor affecting the central nervous system, after a courageous battle with the illness.

How old was Kelley Mack when she passed away?

She was 33 years old.

When and where did Kelley Mack pass away?

She passed away peacefully on August 2, 2025, in her hometown of Cincinnati, Ohio.

What is glioma?

Glioma is a type of tumor that originates in the brain or spinal cord, affecting the central nervous system. It can be aggressive and challenging to treat.

How is Kelley Mack being remembered?

Family, friends, and fans remember her for her warmth, talent, creative passion, and inspiring resilience. Memorial services are planned to celebrate her life.

What were some of Kelley Mack’s notable works?

Besides The Walking Dead, she appeared in Chicago Med, 9-1-1, and various independent films and TV miniseries over her career.