Kelley Mack, a film producer and actress who appeared in "The Walking Dead" and "Chicago Med," died after a brain cancer battle.

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.