Image Credit: Getty Images Kelley Mack, an actress known for her portrayal of Addy in The Walking Dead, died on August 2, 2025, her family announced. She was just 33. Since Mack died at such a young age, fans are mourning her death while wondering what the cause of death was. After all, the late voiceover artist was promoting upcoming film roles during the final months of her life, so her death shocked her fans and industry peers. Mack's sister penned a heartfelt farewell statement to the actress' Instagram page on August 5.