Who Was Kelley Mack? ‘The Walking Dead’ Actress Dies at 33

Kelley Mack, best known for her role as Addy in ‘The Walking Dead’, has died at the age of 33. The news was confirmed by her sister on August 5, 2025, through a post shared on the actress’s official social media accounts.

“She passed away peacefully, surrounded by her mother, aunt, and loved ones,” the post read. Mack had been battling glioma, a rare form of brain tumour that affects around 25% of primary brain tumour cases in the US, according to media sources.

 

 

 

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A post shared by Kelley Mack (@itskelleymack)

Who Was Kelley Mack?

Born as Kelley Lynne Klebenow in 1992 in Cincinnati, Mack showed interest in acting from a young age. She began her journey in the industry through commercials and slowly transitioned into independent films and television.

Her official debut came in 2008 with the short film ‘The Elephant Garden’. The performance earned her an Acting Award from Tisch School of the Arts and a Student Visionary Award at the Tribeca Film Festival, an early sign of her exceptional talent.

Mack’s resume spanned films, TV series, OTT platforms, and even voice acting. She voiced Gwen Stacy in the acclaimed animated film ‘Spider-Man: Into the Spider-Verse’.

 

 

 

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A post shared by Kelley Mack (@itskelleymack)

Kelley Mack Role in The Walking Dead

Mack gained widespread attention for her role as Addy in Season 9 of ‘The Walking Dead’. She appeared in five episodes, playing one of the young survivors captured by the Whisperers.

 

 

 

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A post shared by Kelley Mack (@itskelleymack)

In addition to acting, Mack pursued film production and cinematography. She wrote and produced a short film titled ‘Positive’. Another of her works, ‘A Knock at the Door’, was well-received and earned her nominations at FilmQuest and a Festival Award at the Atlanta Horror Film Festival.

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What Is Glioma?

As reported, Kelley Mack died from glioma, a rare and often aggressive brain tumour. According to the Cleveland Clinic, gliomas form when glial cells, which support the nervous system, begin to grow uncontrollably.

While some gliomas are slow-growing, others are malignant and difficult to treat. They typically remain within the brain or spine, but their invasive nature makes surgical treatment complex.

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