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 .

Mack starred in TV shows like ‘The Walking Dead’ and ‘Chicago Med.’  We’re remembering her life and career here.

Kelley Mack, famous for her roles on "The Walking Dead" and "Chicago Med" has died of cancer at age 33. Her sister, Kathryn, announced Mack's passing Tuesday on Mack's Instagram page. Mack died Saturday according to the post.