Kelley Mack tragically passed away at the young age of 33 after a courageous fight against cancer. Her representative has described this profound loss as “very unexpected,” highlighting the shocking nature of her sudden departure from life.

Kelley gained recognition for her role as Addy in season nine of the acclaimed series The Walking Dead. She also made notable appearances in other popular television shows such as Chicago Med and 9-1-1, showcasing her versatile acting skills.

According to reports from TMZ, Kelley had been undergoing treatment for glioma, a type of cancer affecting the nervous system, and had been showing promising signs of recovery. Unfortunately, she experienced a “sudden” relapse, with the cancer rapidly spreading throughout her body in recent weeks, which took her family and friends by surprise.

Kelley‘s representative shared with People that they were “totally surprised” by her untimely passing, emphasizing the unexpectedness of this tragic event.

Keep reading to find out more about Kelley Mack’s legacy and the impact of her loss…

“We had no idea the turn it took and it was very unexpected,” the representative expressed, reflecting the disbelief surrounding her sudden decline.

Kelley had been actively auditioning for new roles until June 2025. Reports from TMZ indicate that she informed her team in early July that she needed to take a break from work, indicating her awareness of the toll her health was taking on her career.

During this challenging time, we extend our heartfelt condolences to Kelley‘s family, friends, and loved ones as they navigate the profound grief of losing someone so vibrant and talented.