The Walking Dead Star Kelley Mack Dies at 33 After Battling Cancer, Tributes Pour In

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Tragic Loss for The Walking Dead Family

The entertainment world was dealt a heartbreaking blow with the passing of Kelley Mack, the talented actress best known for her role as Addy in The Walking Dead‘s ninth season. Kelley Mack, whose real name was Kelley Lynne Klebenow, died on August 2, 2025, at the age of 33, following a brave battle with glioma, a rare and aggressive form of cancer.

Mack’s death was confirmed by her family in an emotional post shared on her official Instagram account on August 5th. Her family’s statement revealed that Kelley passed peacefully on the evening of August 2nd, surrounded by her loved ones, including her mother, Kristen, and her aunt, Karen. Fans and friends flooded social media with tributes to honor the rising star who made a lasting impression on both the entertainment world and those closest to her.

“It is with indelible sadness that we announce the passing of our dear Kelley,” her family wrote in a tribute shared on her Instagram. “Such a bright, fervent light has transitioned to the beyond, where we all eventually must go. She will be missed by so many to depths that words cannot express.”

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A Rising Star Lost Too Soon

Kelley Mack’s most notable role came as Addy on The Walking Dead, where she appeared in the show’s ninth season, which aired from 2018 to 2019. Though her time on the show was brief, it marked a significant milestone in her acting career, and she gained a dedicated fanbase for her portrayal of a strong, nuanced character.

In addition to her role on The Walking Dead, Mack had a range of guest roles in various TV shows and films, including appearances on 9-1-1, Schooled, and Chicago Med. She also lent her voice to the animated film Spider-Man: Into the Spider-Verse.

Mack’s career was just beginning to take off, and her family expressed their gratitude for the love and support she had received throughout her life.

“Kelley has already come to many of her loved ones in the form of various butterflies 🦋 ❤️,” the family continued in their tribute. “She will be missed by so many to depths that words cannot express.”

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The Battle with Cancer

In an Instagram post shared earlier this year, Mack bravely opened up about her diagnosis, describing how she began experiencing severe back pain in September 2024, which initially seemed like a slipped disc. However, the pain worsened and eventually led to an MRI that revealed a mass on her spinal cord. The diagnosis was confirmed as diffuse midline glioma, a form of cancer that affects the central nervous system, including the brain and spine.

Mack described her struggle with the illness in her Instagram posts, sharing her experiences with treatment, including proton radiation. She remained determined throughout her battle, continually thanking her family and fans for their unwavering support. Her message of hope and positivity inspired many who followed her journey.

“I am determined and know that this will eventually be a short chapter in my long book,” she wrote in January 2025. “The positivity, love, and prayers that are being sent my way already is overwhelming and I feel it all. Thank you so much ❤️❤️.”

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Celebration of Life and Tributes

Kelley Mack’s family has announced that they will honor her with a celebration of life ceremony on August 16 in Glendale, Ohio, where Mack grew up. A later memorial will be held for her friends and colleagues in Los Angeles, where she had spent much of her career.

Several of her co-stars and friends from The Walking Dead shared emotional tributes after learning of her passing. Gustavo Gomez, who starred alongside Mack on the show, expressed his heartbreak on social media:

“This is heartbreaking. I feel so lucky that our paths crossed. Your bright light will always shine on.”

Alanna Masterson, who portrayed Tara Chamber on the show, also paid tribute to Mack, writing:

“What an incredible human, so proud to have fought alongside her in our final episode together.”

Others, like Michael Satrazemis, the director for The Walking Dead, shared similar sentiments, remembering Mack as a “bright light on every level” and sending his love to those who knew her.

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The Legacy of Kelley Mack

Kelley Mack’s impact on the entertainment industry was just beginning. Though her time on the big and small screens was short, she made a lasting impression on everyone she worked with, from co-stars to fans. Her determination, talent, and positive spirit will be remembered by all who knew her.

Mack is survived by her mother, father, sister, brother, and her paternal grandparents. She also leaves behind her boyfriend, Logan Lanier, who was by her side during her battle.

Her death at the young age of 33 is a tragic reminder of the unpredictability of life and the devastating toll that cancer can take on even the strongest individuals.

Fans, family, and colleagues alike continue to express their grief and admiration for Kelley Mack. She may be gone, but her legacy — both as an actress and as a courageous young woman — will continue to inspire those who remember her.

Rest in peace, Kelley Mack. Your bright light will never be forgotten.