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 .

Actor Kelley Mack, best known for playing Addy on "The Walking Dead," died over the weekend, her family announced

Kelley Mack, best known for her role as Addy in "The Walking Dead," has died at the age of 33 after a difficult fight with brain cancer. Her sister, Kathryn Klebenow, announced the sad news on Tuesday through Mack's Instagram.