Kelley Mack — the actress who appeared as Addy on season nine of "The Walking Dead" — died following a battle with a rare form of cancer. She was 33.

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

Known for her performance as Addy in ‘The Walking Dead,’ Mack died at the age of 33 following a months-long battle with a rare form of cancer.