Kelley Mack, known to many for her role as Addy in The Walking Dead Season 9, has died at the age of 33 following a brief but intense battle with an aggressive form of cancer.
According to EW her passing was confirmed by her family, who revealed she died peacefully in Cincinnati, Ohio, surrounded by some of her family members.
“Kelley passed peacefully on Saturday evening with her loving mother Kristen and steadfast aunt Karen present. Kelley has already come to many of her loved ones in the form of various butterflies. She will be missed by so many to depths that words cannot express,” read the statement on instagram.
The actress was diagnosed in January 2025 with a rare and fast-moving central nervous system cancer called diffuse midline glioma, after experiencing symptoms such as lower back pain and neurological difficulties in late 2024.
According to reports by New York Post, despite undergoing intensive treatment and enduring a spinal biopsy that severely impaired her mobility, she maintained an open and courageous outlook, even sharing parts of her journey on social media.
Her sister Kathryn Klebenow confirmed her death in a heartfelt Instagram post, calling Kelley “a bright, fervent light” and expressing both pride and heartbreak over her loss.
Kelley Mack began her career in childhood, acting in commercials before moving on to short films and eventually television.
While she gained widespread recognition for her role in AMC’s ‘The Walking Dead’, she also appeared in popular shows such as ‘Chicago Med’ and ‘9-1-1.’
Condolences have poured in from colleagues, friends and fans remembering her as “talented” and a “sweet soul.”
“What an incredible human. So proud to have fought alongside her in our final episode together,” wrote Alanna Masterson, who also starred in ‘The Walking Dead.’