Kelley Mack, an immensely talented actress renowned for her role as Addy in The Walking Dead, tragically passed away on August 2, 2025, as confirmed by her family. She was only 33 years old, leaving her fans and friends in deep mourning. Given her young age and vibrant career, the news of her untimely death has left many questioning the cause of death. Mack had been actively promoting her upcoming film projects in the months leading up to her passing, making her sudden death a shocking event for her supporters and colleagues in the entertainment industry.
On August 5, Mack’s sister shared an emotional tribute on the actress’ Instagram page, expressing their profound loss. The heartfelt message mentioned that Kelley had passed away “peacefully” while surrounded by her mother and aunt, highlighting the love and support she received in her final moments.
“It is with indelible sadness that we are announcing the passing of our dear Kelley,” the statement began, showcasing the deep sorrow felt by her loved ones. “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.” This touching tribute underlines the impact Mack had on those who knew her and the legacy she leaves behind.
Mack’s sister further elaborated that she “would want you all to know how much she loves you. And as her sister, I want you all to know how brave that tough SOB was, especially when she decided to make the leap to be reunited with God. I’m so f**king proud of her.” This heartfelt message captures the strength and bravery that Kelley embodied throughout her life, showcasing her unwavering spirit even in the face of adversity.
Below, Hollywood Life pays tribute to Kelley Mack, honoring her remarkable life, illustrious career, and the courageous health battle she faced leading up to her death. Her story is one of resilience and talent that resonates deeply with her fans and peers alike.
Discover the Life and Achievements of Kelley Mack
Kelley Mack was not only an accomplished actress but also a talented voiceover artist and producer. According to her IMDb profile, this Ohio native dabbled in various aspects of film production. She gained recognition for her compelling performances as Addy in The Walking Dead, Alice in Broadcast Signal Intrusion, and Penelope Jacobs in Chicago Med. Kelley’s diverse roles showcased her range and versatility as a performer, earning her a dedicated following in the entertainment industry.
In addition to her acting prowess, Mack had a passion for storytelling that extended beyond performance. She studied film production and cinematography, as noted on her IMDb page, reflecting her desire to understand the entire filmmaking process. Kelley produced a film that premiered on AMC’s Shudder and won the Jury Choice Award at the Atlanta Horror Film Festival, highlighting her talents not just in front of the camera but behind it as well. Her contributions to the film industry were significant and will be remembered.
Kelley Mack’s Cause of Death: What Led to Her Untimely Passing?
In January 2025, Mack bravely revealed that she was battling a rare type of astrocytoma cancer known as diffuse midline glioma. This form of cancer is characterized as a type of brain tumor, with diffuse midline glioma specifically starting in the brain or spinal cord, as defined by the National Cancer Institute. Her openness about her diagnosis provided insight into the challenges she faced during her final months.
While Mack’s family has not publicly disclosed the exact cause of her death, it is clear that she passed away after a grueling battle with cancer. Her IMDb profile further indicates that she succumbed to cancer affecting her central nervous system, a devastating conclusion to her courageous fight against this aggressive illness.
Understanding Kelley Mack’s Health Journey and Cancer Struggles
In January 2025, Mack shared her diagnosis of diffuse midline glioma with her followers in an emotional Instagram post, providing a glimpse into her health journey. She included poignant photos from her time in the hospital, illustrating the physical and emotional toll of her illness.
Mack recounted her experience, noting, “In September, I moved into a new apartment with my boyfriend, Logan. For a month after that, I had persistent lower back pain and thought I slipped a disc.” As her symptoms progressed, she experienced neuropathic itching in her right thigh, followed by intense shooting pains in her legs and back, which forced her to sleep in a recliner for a month due to the discomfort. On Thanksgiving Eve, she underwent emergency MRIs at the hospital, which revealed an abnormal mass in her spinal cord, indicating the severity of her condition.
Mack bravely shared that, “due to the biopsy surgery on [her] spinal cord, [she had] lost the use of [her] right leg and most of [her] left leg,” significantly impacting her mobility. As a result, she relied on a walker and wheelchair to navigate her surroundings, showcasing the profound challenges she faced daily.
During her battle, Mack indicated that she would undergo radiation treatment in Cincinnati, Ohio, in hopes of improving her condition. In March, she posted on Instagram that her health was showing signs of improvement. Throughout her final months, Kelley remained dedicated to her craft, continuing to promote her on-screen projects, demonstrating her unwavering commitment to her career and her fans.
