Actress Kelley Mack, best known for her role playing Hilltop Colony resident Addy on The Walking Dead, has died at age 33.
Mack died Saturday in Cincinnati after being diagnosed with glioma of the central nervous system, according to a statement shared by her family. A CaringBridge page had been set up months ago to provide updates on her condition.
A remembrance is planned for August 16 in Ohio, with a further celebration of life to be held at a future date in Los Angeles, where Mack lived and worked for the last 11 years.
“Her vibrant spirit, creative passion and dedication to storytelling left an indelible mark on those who knew her and the audiences she captivated through her work,” her family said.
Born Kelley Lynne Klebenow, Mack joined The Walking Dead during season nine for five episodes.
Kelley Mack has died at age 33 (Getty)
Before rising to fame on the hit AMC show, Mack appeared in several shorts and TV miniseries, including Unusual Suspects (2015), Grayson: Earth One (2015), Not Your Average Joe (2016), and Unscrewed (2016). She amassed dozens of TV and film credits throughout her career.
Mack also appeared on episodes of 9-1-1 in 2019 and Chicago Med in 2022. Her credits spanned multiple commercials for Budweiser, Dr Pepper, Dairy Queen, and Chick-fil-A, among others.
Off-screen, Mack lent her voice to several notable projects, including as Hailee Steinfeld’s voice match on the Oscar-winning Spider-Man: Into the Spider-Verse (2018) and a 2024 Hyundai Ioniq commercial.
Mack’s final credit, both on-screen and as executive producer, is the forthcoming Universal (2025). Just weeks before her death, she shared a post on Instagram advertising the film’s world premiere at the Chinese Theatre on Hollywood Boulevard in Los Angeles.
“It’s a small, down-to-earth film about huge, out-of-this-world concepts, and we’re looking forward to sharing it with you,” the caption read in part.
In a separate post about the premiere, Mack wrote: “In this comedy/drama/sci-fi, a couple of academics enjoying a romantic break in a remote log cabin find their stay interrupted by someone who has tracked them down, seeking their help with what could be the biggest discovery in history.”
Outside of her acting and producing career, Mack’s family remembered her as an accomplished college tennis player who loved hiking, pickleball, biking, playing piano and traveling.
Mack is survived by her parents, brother Parker and sister Kathryn, grandparents, and her “dearest boyfriend,” Logan.
