A brain tumor has claimed the life of Kelley Mack, known for her role as Addy in the ninth season of the series The Walking DeadThe actress had been battling the disease for almost a year. Her family announced the news of her death, which occurred on Saturday in Cincinnati, her hometown. "It is with profound sadness that we announce the passing of our beloved Kelley. Such a bright and fervent light has passed on to the afterlife, where we all must eventually go," they wrote on Tuesday. The young woman died "peacefully," and her mother and aunt were with her until the end during her treatment for cancer that was diagnosed in November of last year and that affected her central nervous system.