The entertainment world was struck with profound sadness on August 2, 2025, when actress Kelley Mack, best known for her role as Addy in The Walking Dead, passed away at the age of 33. Her untimely death due to a rare form of cancer, diffuse midline glioma, has left fans, colleagues, and loved ones mourning a vibrant talent whose warmth and creativity touched countless lives. This article celebrates Kelley Mack’s life, career, and enduring legacy, exploring her contributions to film and television, her personal passions, and the impact she had on those around her.
A Rising Star in Hollywood
Kelley Mack, born Kelley Lynne Klebenow on July 10, 1992, in Cincinnati, Ohio, was a multifaceted artist whose love for storytelling blossomed early. As a child, she received a mini video camera as a birthday gift, sparking a passion that would define her career. From acting in commercials as a young girl to earning critical acclaim, Mack’s journey was one of dedication and creativity. Her family described her as a “bright, fervent light,” a sentiment echoed by fans and peers alike.
Mack’s breakout role came in 2008 with The Elephant Garden, where she played Chloe and earned an Acting Award from Tisch School of the Arts. The film also won the Student Visionary Award at the Tribeca Film Festival, marking Mack as a talent to watch. Her early success set the stage for a career that spanned television, film, voice acting, and producing, showcasing her versatility and commitment to her craft.
Kelley Mack’s Iconic Role in The Walking Dead
For many, Kelley Mack will forever be remembered as Addy, a resilient survivor in the Hilltop Colony during Season 9 of The Walking Dead (2018–2019). Her portrayal of Addy, a character caught in the gripping drama of the Whisperers’ arc, resonated with fans of the AMC series. Mack appeared in five episodes, leaving a lasting impression with her ability to convey strength and vulnerability. Her co-star Alanna Masterson, who played Tara Chambler, paid tribute, saying, “What an incredible human. So proud to have fought alongside her in our final episode together.”
Mack’s work on The Walking Dead was just one highlight in a career that included 35 acting credits and five producing credits. She brought depth to roles in shows like Chicago Med, where she played Penelope Jacobs in Season 8, and 9-1-1, as well as films such as Broadcast Signal Intrusion (2021) and Delicate Arch (2024). Her upcoming role as Ricky in the 2025 film Universal, where she also served as an executive producer, underscored her growing influence in the industry.
A Voice That Resonated
Beyond the screen, Kelley Mack’s voice work added another dimension to her legacy. She served as the voice match for Hailee Steinfeld’s Gwen Stacy in the Oscar-winning Spider-Man: Into the Spider-Verse (2018) and lent her voice to a 2024 Hyundai Ioniq commercial. Her ability to bring characters to life through voice acting showcased her range and dedication to storytelling. Mack’s commercial work was equally prolific, with appearances in campaigns for Dr. Pepper, Chick-fil-A, Dairy Queen, and Rakuten, often alongside her mother, Kristen Klebenow.
Her passion for storytelling extended to writing and producing. Mack collaborated with her mother on several feature scripts, including On the Black, a 1950s-era college baseball story inspired by her maternal grandparents’ time at Ohio University. This creative partnership highlighted her deep connection to family and her commitment to meaningful narratives.
A Life of Passion and Purpose
Kelley Mack’s life was as vibrant off-screen as it was on. An accomplished college tennis player, she loved hiking, pickleball, biking, playing the piano, and traveling. Her adventurous spirit and zest for life were evident in her social media posts, where she shared personal milestones and professional achievements. Mack’s warmth and creativity were infectious, inspiring those around her. Her family noted that she cherished collaboration and found joy in bringing stories to life.
Born to Kristen and Lindsay Klebenow, Mack grew up in Ohio, Missouri, Illinois, and North Carolina before settling in Los Angeles for the past 11 years. She graduated from Hinsdale Central High School in 2010 and earned a bachelor’s degree in cinematography from Chapman University’s Dodge College of Film and Media Arts in 2014. Her education and early experiences shaped her into a versatile artist who excelled in acting, producing, writing, and cinematography.
Battling Diffuse Midline Glioma
In January 2025, Kelley Mack bravely shared her diagnosis of diffuse midline glioma, a rare and aggressive cancer affecting the central nervous system. This type of tumor, which begins in the brain or spinal cord, is particularly challenging to treat, often requiring surgery, radiation, and chemotherapy. Mack’s openness about her health journey inspired many, as she documented her resilience on social media. In a March post, she shared a video of herself re-learning to walk up stairs, a milestone she celebrated with her boyfriend, Logan Lanier, by her side. “It’s a big deal for me,” she wrote, reflecting her determination despite the physical toll of her illness.
Mack’s battle was marked by courage and faith. In a January Instagram post, she wrote, “This experience has brought me closer to God, and I am leaning on him and trust his plan for me.” Her strength resonated with fans and loved ones, who admired her grace under pressure. Tragically, Mack passed away peacefully on August 2, 2025, in Cincinnati, surrounded by her mother, Kristen, and aunt, Karen. Her sister, Kathryn, shared that Kelley had “come to many of her loved ones in the form of various butterflies,” a poignant symbol of her enduring spirit.
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A Legacy of Love and Inspiration
Kelley Mack’s impact extended far beyond her roles on screen. Colleagues and fans remembered her as a “sweet soul” and a “talented” artist whose enthusiasm was contagious. The Walking Dead director Michael Satrazemis wrote, “I was lucky enough to create with Kelley on TWD. A bright light on every level.” Her co-star Gustavo Gomez added, “Your bright light will always shine on.” These tributes reflect the profound mark she left on the industry and those who knew her.
Mack is survived by her parents, Kristen and Lindsay Klebenow; her siblings, Kathryn and Parker (also an actor); her grandparents, Lois and Larry Klebenow; and her boyfriend, Logan Lanier. A remembrance gathering is scheduled for August 16 in Glendale, Ohio, with a celebration of life planned in Los Angeles for her friends and colleagues. Her family emphasized that “Kelley’s legacy will live on through her contributions to film and television, and in the hearts of those who loved her.”
The Enduring Impact of Kelley Mack
Kelley Mack’s story is one of resilience, creativity, and love. From her early days with a video camera to her memorable performances in The Walking Dead and beyond, she lived with purpose and passion. Her battle with cancer, though heartbreaking, showcased her strength and faith, inspiring others to cherish life and pursue their dreams. As fans and loved ones honor her memory, Mack’s work continues to captivate audiences, and her spirit lives on in the stories she told and the lives she touched.
Her upcoming film Universal will serve as a final testament to her talent, both as an actress and executive producer. As we remember Kelley Mack, we celebrate a woman who embodied kindness, creativity, and an unwavering dedication to storytelling. Her light may have transitioned, but it will never fade.
Frequently Asked Questions (FAQ)
Q: Who was Kelley Mack?
A: Kelley Mack, born Kelley Lynne Klebenow, was an American actress, producer, and voiceover artist known for her role as Addy in Season 9 of The Walking Dead. She also appeared in Chicago Med, 9-1-1, and films like Broadcast Signal Intrusion. Mack passed away on August 2, 2025, at age 33 after battling diffuse midline glioma.
Q: What was Kelley Mack’s cause of death?
A: Kelley Mack died of diffuse midline glioma, a rare and aggressive cancer affecting the central nervous system. She was diagnosed in late 2024 and passed away peacefully on August 2, 2025, in Cincinnati, Ohio.
Q: What roles did Kelley Mack play?
A: Mack was best known for playing Addy in The Walking Dead (Season 9), Penelope Jacobs in Chicago Med (Season 8), and roles in 9-1-1 and films like Broadcast Signal Intrusion and Delicate Arch. She also voiced Gwen Stacy in Spider-Man: Into the Spider-Verse and appeared in commercials for brands like Dr. Pepper and Chick-fil-A.
Q: Did Kelley Mack have any upcoming projects?
A: Yes, Mack will posthumously appear as Ricky in the 2025 film Universal, where she also served as an executive producer. She had been promoting the comedy/drama/sci-fi project on social media before her passing.
Q: How is Kelley Mack being remembered?
A: A remembrance gathering is set for August 16, 2025, in Glendale, Ohio, with a celebration of life planned in Los Angeles. Fans and colleagues have paid tribute to her warmth, talent, and vibrant spirit, with many noting her symbolic presence as butterflies.
Q: Did Kelley Mack have family in the entertainment industry?
A: Yes, her brother, Parker Mack, is also an actor known for roles in Chasing Life and Faking It. Kelley collaborated with her mother, Kristen Klebenow, on several screenplays, including On the Black.
Disclaimer
This article is based on information from reputable sources, including news outlets and public statements, and is intended to provide an accurate and respectful tribute to Kelley Mack. While every effort has been made to ensure the accuracy of the information, some details may be subject to change as new information emerges. For the most current updates, refer to trusted news sources. This content is for informational purposes and does not reflect the views or opinions of any specific organization unless explicitly stated.
