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.

Actor Kelley Mack, best known for playing Addy on "The Walking Dead," died over the weekend, her family announced. She was 33. "Such a bright, fervent light has transitioned to the beyond, where we all eventually must go," her sister Kathryn wrote on Mack’s Instagram on Tuesday.

'The Walking Dead' Star Kelley Mack Detailed Health Battle Before Death at 33 originally appeared on Parade. The Walking Dead star Kelley Mack bravely detailed her cancer battle on social media before she died at the age of 33.