Kelley Mack, a versatile actress known for her memorable role as the Hilltop Colony resident Addy on AMC’s The Walking Dead and as a voice artist in the Oscar-winning film Spider-Man: Into the Spider-Verse, has died. She was 33.

Mack passed away on Saturday in Cincinnati following a courageous battle with glioma of the central nervous system, a form of brain cancer. Her family confirmed the news in a heartfelt statement, remembering a woman whose creative passion touched everyone she met. A CaringBridge page had been established months prior to keep friends, family, and fans updated on her health journey.

“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. The sentiment captures the essence of a performer whose career, though tragically short, was marked by a remarkable range and a deep commitment to her craft.

Born Kelley Lynne Klebenow, Mack built an impressive and eclectic resume over 11 years working in Los Angeles. While many fans will remember her from her five-episode arc during season nine of The Walking Dead, where she navigated the treacherous post-apocalyptic world, her body of work spanned dozens of television and film credits. She brought her talent to primetime dramas with guest appearances on Fox’s 9-1-1 in 2019 and NBC’s Chicago Med in 2022, demonstrating a consistent ability to step into established and popular series.

Before her higher-profile roles, Mack was a fixture in the world of short films and television miniseries, honing her craft in projects like Unusual Suspects and Grayson: Earth One. She was also a familiar face in the commercial world, lending her charisma to major national campaigns for iconic brands such as Budweiser, Dr Pepper, Dairy Queen, and Chick-fil-A.

Perhaps one of the most surprising and telling credits of her career was one where her face was never seen. Mack was a gifted voice artist, and her talent led her to a pivotal role in the 2018 Oscar-winning animated feature, Spider-Man: Into the Spider-Verse. She served as the official voice match for actress Hailee Steinfeld, who voiced the character of Gwen Stacy/Spider-Gwen. It was a testament to her vocal skill and her ability to contribute meaningfully to a massive cultural touchstone, even from behind the scenes.

In a poignant capstone to her career, Mack’s final project was one she shepherded herself. She was not only the star but also an executive producer of the forthcoming film Universal (2025). Her role behind the camera showcased her evolution as a complete storyteller, passionate about bringing entire concepts to life. Just weeks before her passing, she took to Instagram to celebrate the film’s world premiere at the iconic Chinese Theatre on Hollywood Boulevard. Her excitement was palpable.

“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,” she wrote in a caption. In another post, she described the sci-fi comedy/drama’s intriguing plot about two academics whose romantic getaway is interrupted by someone seeking their help with what could be history’s greatest discovery. Her final posts were not of struggle, but of creative pride and a desire to share her work with the world, a moving final chapter in her professional story.

Beyond the soundstages and recording booths, her family remembered a woman with a zest for life. She was an accomplished college tennis player before pursuing her acting career full-time. She found joy in the outdoors, an avid hiker who also loved pickleball and biking. Her creative spirit extended to music, as she was also a talented piano player. She loved to travel, always embracing new experiences.

A remembrance for Mack is scheduled for August 16 in her home state of Ohio. A further celebration of her life is planned for a future date in Los Angeles, the city where she built her career and lived for over a decade.

Kelley Mack is survived by her parents; her brother, Parker; her sister, Kathryn; her grandparents; and her boyfriend, Logan. She leaves behind a legacy of creativity, resilience, and a body of work that will continue to captivate audiences and serve as a reminder of a vibrant talent gone too soon.