Actress Kelley Mack, known for her appearance in post-apocalyptic zombie drama “The Walking Dead,” has died. She was 33.

Kelley Mack, who played Hilltop resident Addy on 'The Walking Dead' and appeared in Dr Pepper's 'Fansville' ads, dies of a rare form of cancer at age 33.

The family of The Walking Dead alum Kelley Mack, who died Aug. 2 following a battle with a rare form of cancer, revealed her cause of death.