The entertainment world has lost a bright star with the passing of actress Kelley Mack, who was best known for her role as Addy on The Walking Dead. At just 33 years old, she died after bravely battling a rare form of cancer. Kelley’s death has left a void in the hearts of fans, friends, and colleagues alike.
A Shining Star Lost Too Soon
Kelley Mack was much more than an actress—she was a symbol of strength and resilience. Known for her role as Addy in The Walking Dead and her guest appearances on 9-1-1 and Chicago Med, Kelley’s career was on the rise, even as she faced a life-threatening illness. She was diagnosed with a rare, aggressive brain cancer called diffuse midline glioma, which led to her passing on August 2, 2025.
Despite her illness, Kelley remained positive, sharing updates with fans and continuing to work on new projects. Her strength throughout her health battle was a testament to her spirit, and her passion for storytelling never wavered. Fans and colleagues alike were touched by her ability to continue moving forward, even when the odds were against her.
A Loving Family, A Brave Actress
Kelley’s family, especially her sister Kathryn, shared heartfelt tributes on social media, expressing their sorrow and admiration for her courage. In a post from August 5, Kathryn shared, “Kelley has already come to many of her loved ones in the form of various butterflies. She will be missed by so many to depths that words cannot express.”
Kelley passed away peacefully, surrounded by loved ones, leaving behind a legacy of love, laughter, and unforgettable performances. Her sister’s words capture the essence of Kelley’s strength: “She would want you all to know how much she loves you… I’m so f–king proud of her.”
A Career Cut Short, But Never Forgotten
Though Kelley’s life was tragically short, her career was one filled with promise. In addition to her role on The Walking Dead, she had 32 other credits, including the upcoming film Universal, and her performance in Mr. Manhattan alongside Harry Shum Jr.
Her passion for acting was clear in every project she took on, and she often expressed her love for the craft on social media, stating, “I love acting so much and it warms me to know when others are touched by the stories I’m so lucky to be a part of sharing.”
Kelley Mack may no longer be with us, but her contributions to television and film will continue to inspire and resonate for years to come.