The tragic news of Kelley Mack’s death has left fans of The Walking Dead heartbroken. The talented actress, known for her role as Addy in the hit AMC series, passed away at the age of 33. As word spread, fans and industry peers have sought details about her cause of death and her inspiring battle with a rare illness.
So, here’s everything we have learned about Kelley Mack’s passing and the circumstances surrounding it.
Kelley Mack dies at 33, claims report
Kelley Mack, best known for her roles in The Walking Dead, 9-1-1, and Chicago Med, passed away on August 2, 2025.
Her family confirmed that she died at 33 after a brave battle with a rare and aggressive form of cancer.
Her sister, Kathryn, shared the heartbreaking news on Instagram on August 5, writing, “It is with indelible sadness that we are announcing the passing of our dear Kelley. Such a bright, fervent light has transitioned to the beyond, where we all eventually must go.” Kathryn revealed that Kelley passed away peacefully, surrounded by their mother, Kristen, and aunt, Karen. She added that loved ones have seen butterflies as signs from Kelley, symbolizing her enduring presence.
Born Kelley Lynne Klebenow in Cincinnati, Ohio, the actress succumbed to diffuse midline glioma — a rare and aggressive brain cancer that affects the central nervous system. Her obituary detailed her courageous fight and noted that she remained positive throughout her journey.
Kathryn honored her sister with a heartfelt tribute, writing, “She would want you all to know how much she loves you. And as her sister, I want you all to know how brave that tough SOB was, especially when she decided to make the leap to be reunited with God. I’m so proud of her.”
Kelley first revealed her diagnosis publicly in January, explaining that after undergoing a biopsy on her spinal cord, she lost the use of her right leg and most of her left. She began using a walker and wheelchair but continued to fight and share her recovery updates with fans. In March, she posted a video proudly walking up and down stairs with the help of her boyfriend, Logan, writing, “Life has also had its ups and downs lately am I right lol.”
Despite her illness, Kelley finished filming Universal with Rosa Robson and Joe Thomas. Her memorial will be held in Ohio on August 16.
