Joshua Goldman
Joshua Goldman
min read · August 7, 2025 · Entertainment

Tragic Loss: Rising Star Kelley Mack's Heartbreaking Passing at 33

The Walking Dead actress Kelley Mack suffered a 'sudden relapse' after initially making a 'nice recovery ' from cancer treatment before her shock death aged 33 - pictured October 2021

SHOCKING DEATH OF THE WALKING DEAD STAR KELLEY MACK: Beloved Actress Dies at 33 After Cancer Relapse

In a devastating turn of events, Kelley Mack, the talented actress known for her role as Addy in The Walking Dead's ninth season, has passed away at just 33 years old. The rising star had been battling glioma of the central nervous system, a rare and aggressive form of cancer, and had seemingly made a remarkable recovery after undergoing treatment earlier this year.

However, according to sources close to the actress, Mack's cancer relapsed "out of nowhere" in July, spreading rapidly through her body. The sudden turn of events left friends, family, and fans stunned, as she had been actively auditioning for roles just weeks before her passing.

Mack (R) scored her most prominent role during her lifetime as Addy on The Walking Dead's ninth season, which aired from 2018 to 2019; pictured with (L¿R) Jackson Pace and Joe Ando-Hirsch

"It was like a punch to the gut," a family insider revealed to The Scholarly Note. "Kelley had been doing well, and everyone thought she was on the road to recovery. But then, without warning, the cancer came back with a vengeance."

Mack's representative confirmed that her death was a total surprise, stating that "no one expected" it. The actress had been in good spirits just months prior, even going so far as to audition for roles requiring characters with mobility issues – a testament to her determination and resilience.

As news of Mack's passing spread like wildfire, tributes began pouring in from her co-stars and fellow industry professionals. Anthony Michael Lopez, who worked alongside Mack on The Walking Dead, shared a heartfelt message: "My deepest condolences, Kelley was such a sweet and happy soul... She fought so hard."

A family source told TMZ that Mack underwent treatment for glioma in February and had recovered well - before her cancer relapsed 'out of nowhere' and spread through her body. They added she had a 'quick end'

Gustavo Gomez, another co-star, echoed similar sentiments: "This is heartbreaking. I feel so lucky that our paths crossed. Your bright light will always shine on."

But what's even more remarkable about Mack's story is the courage she showed in sharing her struggles with cancer publicly. In January, just a few months after being diagnosed, the actress took to Instagram to share her journey, writing: "I'm still trying to wrap my head around this... But I know that with treatment and love, I will get through this."

Mack's determination was evident as she began undergoing radiation treatments in Cincinnati, close to her family. She even continued to work behind the scenes, producing and voice acting for various projects – including a role in Spider-Man: Into The Spider-Verse.

'It is with indelible sadness that we are announcing the passing of our dear Kelley,' her family wrote in a post shared to her Instagram account

Born in Cincinnati, Mack moved around during her childhood, settling in various states across the country. She studied cinematography at Chapman University's Dodge College of Film before making her way into the industry as an occasional producer, writer, and voice actor.

As news of her passing continues to spread, fans are left reeling – wondering how someone so full of life and promise could be taken from us so soon. But Mack's legacy lives on through her courageous story, inspiring others to face their own battles with strength and resilience.

In a statement shared on CaringBridge, Mack's family wrote: "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."

A celebration of life ceremony is scheduled for August 16 in Glendale, Ohio, with a later memorial planned for friends and colleagues located around Los Angeles.

As we say goodbye to this talented young star, let's remember the impact she had on those around her – and strive to carry on her courageous spirit.

Following the news of her death, her celebrity friends including her co-stars from The Walking Dead shared heartfelt tributes to the beloved actress

She is pictured undergoing proton radiation in photographs shared to her Instagram page during her treatment

In January, Mack revealed on Instagram that she had first noticed symptoms of what was later diagnosed as a rare form of cancer in September 2024; pictured in October 2021 in LA

The actress shared a photo of herself in a hospital bed and recounted how her shooting back and leg pain forced her to 'sleep in a recliner for a month because laying down was too painful'

In January, Mack revealed on Instagram that she had first noticed symptoms of what was later diagnosed as a rare form of cancer in September 2024 (pictured undergoing proton radiation)

Mack's family noted that she would be honored at a celebration of life ceremony in Glendale, Ohio , on August 16

Mack also had guest roles on 9-1-1, Schooled and Chicago Med. She will be honored with a celebration of life ceremony in Glendale, Ohio, on August 16; pictured in October 2021 in LA