Kelley Mack’s death on Aug. 2 at age 33 was "very unexpected," her rep tells PEOPLE. The 'Walking Dead' actress was still auditioning in June despite her cancer diagnosis and her agents were "totally surprised" by the news.

Actress Kelley Mack's death came as a shock to those in her inner circle after she underwent treatment during her glioma battle. A rep for the Walking Dead alum told TMZ that her death was a "total" surprise,

Kelley Mack, an actor who starred in "The Walking Dead," died due to complications from the COVID-19 vaccine. Actor Kelley Mack, who was best known for playing Addy on the TV show "The Walking Dead," died at age 33 on Aug. 2, 2025, her sister announced in an Instagram post.