Los Angeles, August 6, 2025 — Hollywood actress Kelley Mack, best known for portraying Addy in the popular series The Walking Dead, has passed away at the age of 33. She breathed her last on August 2 in her hometown of Cincinnati. According to reports, Kelley was battling glioma — a rare and aggressive form of brain cancer that affects the central nervous system.
The heartbreaking news was confirmed by her sister, Katherine, in a heartfelt tribute shared on August 5. “Our beloved Kelley is no longer with us. She was a bright and resilient soul,” Katherine wrote. She also revealed that Kelley’s mother, Kristen, and her aunt, Karen, were by her side during her final moments. In a poetic note, she added, “She’s returned to us now in the form of butterflies.”
Kelley Mack appeared in five episodes of The Walking Dead Season 9, leaving a lasting impact on viewers despite her limited screen time. Her role in the hit AMC series earned her industry-wide recognition and opened doors to several television opportunities.
Following her breakout performance, Mack went on to act in other well-known shows like 9-1-1, Chicago Med, and Schooled. She also starred alongside Harry Shum Jr. in the indie thriller Broadcast Signal Intrusion, further showcasing her talent and versatility as an actress.
Fans and fellow artists have taken to social media to mourn the untimely loss of a gifted performer whose rising career was tragically cut short.