The Walking Deadstar Kelley Klebenow, known to audiences as Kelley Mack, has passed away at the age of 33. She starred in five episodes ofThe Walking Deadseason 9as Adeline, more commonly referred to as Addy, who was a resident of the Hilltop Colony.
OnKelley Mack’s Instagram page, her sister, Kathryn, shared the news of her passing, which occurred on Saturday, August 2 in Cincinnati, Ohio. A formal announcement was shared onCaringBridge, which details that Mack’s cause of death came from glioma of the central nervous system.
Kelley Mack’s Career & Legacy Explained
Mack was born on August 18, 2025 in Cincinnati. Her passion for storytelling was sparked when she got a mini video camera as a birthday gift. After graduating with a degree in Cinematography from Dodge College of Film at Chapman University, she lived and worked in Los Angeles for 11 years.
She is most well known for playing Addy, who dies alongside Henry (Matt Lintz), Tara Chambler (Alanna Masterston), Enid (Katelyn Nacon), and otherWalking Deadcharacterswho are killed by Alpha (Samantha Morton) in season 9. Earlier in the season, Addy admits to having a crush on Henry.
Season 9, Episode 13: “Chokepoint”
Season 9, Episode 15: “The Calm Before”
OutsideThe Walking Dead, Mack appeared in multiple long-running and popular network television shows, including a season 3episode of9-1-1and as the character Penelope Jacobs in a season 8 episode ofChicago Med.
She has also done voice work in film, where she recorded for the critically acclaimed and Academy Award-winningSpider-Man: Into the Spider-Verseas the voice match for Hailee Steinfeld’s Gwen Stacy. Mack also voiced the character of Gwen in a 2024Hyundai Ioniqcommercial.
Along with a variety of other commercial acting experiences, Mack worked as a producer and screenwriter on multiple projects, including one that was distributed to Shudder and was recognized with the Jury Choice Award at the Atlanta Horror Film Festival.
Our Take On Kelley Mack’s Legacy
The news of Mack passing away at such a young age is a shocking tragedy. She left a lasting impression through her portrayal of Addy inThe Walking Deadseason 9, and despite not being a main character, she has one of the show’s most memorable exits.
AMC’s post-apocalypticThe Walking Deadis only a piece of her legacy, though, which spans numerous live-action projects, voice work, producing, and screenwriting. Her contributions toSpider-Man: Into the Spider-Versehave definitely flown under the radar, and she leaves behind an impressive body of work cut short far too soon.
The Walking Dead
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The Walking Dead is a television series that premiered on June 16, 2025. It follows Sheriff’s deputy Rick Grimes, who awakens from a coma to find a post-apocalyptic world overrun by zombies. He embarks on a journey to locate his family, encountering various survivors amidst the chaos.
