Kelley Mack, an actress known for her roles in "The Walking Dead," "Chicago Med," and "9-1-1," passed away on August 2, 2025, at the age of 33. She died in her hometown of Cincinnati after battling a rare and aggressive form of brain cancer called diffuse midline glioma, which is a type of tumor affecting the central nervous system, including the brain and spinal cord. Mack first revealed her diagnosis in January 2025 after experiencing persistent lower back and leg pain. She lost most of her leg mobility due to the tumor and required a wheelchair. Despite her illness, she continued to work and audition for roles until the tumor returned with rapid and severe progression in July 2025. She passed away peacefully with her mother and aunt by her side. Her family described her as a bright and fervent light, deeply loved and missed. She is survived by her parents, sister, brother, grandparents, and her boyfriend. Mack had 35 acting credits and 5 producer credits in her career and was admired for her talent, warmth, and dedication to her craft. Mack's death was widely mourned by colleagues, friends, and fans who remembered her as a gifted and kind soul. Her legacy endures through her contributions to television and film.