Kelley Mack, best known for her role as Addy in The Walking Dead, has died at the age of 33. Her family confirmed her passing on August 2, 2025, just weeks after she celebrated her birthday on July 10. Kelley passed peacefully in Cincinnati, with her mother Kristen and aunt Karen by her side.
In a heartfelt message posted on Instagram and CaringBridge, her sister Kathryn described her as “a bright, fervent light” whose absence is felt beyond what words can express.
Kelley had been fighting glioma of the central nervous system — a rare and aggressive brain cancer. Her diagnosis came after months of unexplained back pain and leg weakness, which led to a spinal cord biopsy and ultimately the loss of mobility in both legs.
Still, Kelley faced the disease with courage and grace. She shared her journey publicly, from the shock of her diagnosis to undergoing proton radiation therapy, documenting both the hardships and the small victories along the way. Her resilience and faith remained at the center of her posts, often highlighting her gratitude for her loved ones and her deepened connection to God.
Born Kelley Lynne Klebenow in Cincinnati, she graduated from Hinsdale Central High School and earned a degree in cinematography from Chapman University in 2014. She moved to Los Angeles to pursue her passion for film and television and found success both in front of and behind the camera.
Kelley’s acting credits spanned Chicago Med, Broadcast Signal Intrusion, 9-1-1, and voice work on The AM Archives. She also contributed to the crew of Spider-Man: Into the Spider-Verse, showcasing her range in the industry.
A remembrance service will be held on August 16 in Ohio, with a separate celebration planned in Los Angeles. Kelley is survived by her parents, siblings, grandparents, and boyfriend, Logan Lanier.
Her final Instagram updates were full of hope — celebrating milestones in her recovery and reflecting on her time with family. Even as her condition worsened, she continued to inspire with her positivity and strength.
Kelley’s passing comes during a week of sorrow in Hollywood, following the death of WKRP in Cincinnati star Loni Anderson, who died at age 79 after a prolonged illness. Anderson, remembered for redefining the “blonde bombshell” trope with intellect and charm, left a legacy of groundbreaking work and was honored by peers including Morgan Fairchild.
While both women came from different generations of television, their impact on screen and the lives they touched remain lasting testaments to their talent and spirit.