Walking Dead actress Kelley Mack dies at 33 Kelley Mack has died at the age of 33 after battling glioma of the central nervous system. 6 August 2025 Kelley Mack has died at the age of 33. Kelley Mack has died The Walking Dead actress - whose real name was Kelly Klebenow - passed away on 2 August after battling glioma of the central nervous system, a cancerous tumour, her devastated family have involved. Her sister posted on Kelley's Instagram account: "It is with indelible sadness that we are announcing the passing of our dear Kelley.