Kelley Mack's death was 'total surprise' Kelley Mack's death came as a "total surprise" to those close to her as she had experienced a "nice recovery" following cancer treatment earlier this year, only to relapse recently. 8 August 2025 Kelley Mack's death came as a "total surprise" to those close to her. Kelley Mack's loved ones weren't expecting her death The Walking Dead actress passed away on 2 August at the age of 33 after being diagnosed with glioma, cancer of the central nervous system, in February, but she had been feeling much better in the months leading up to her passing.