Kelley Mack, ‘The Walking Dead’ and ‘Chicago Med’ Actress, Dies at 33

Kelley Mack, known for her role as Addy in Season 9 of The Walking Dead, died on August 2 in Cincinnati, Ohio. She was 33. Her death followed a battle with glioma, a form of cancer affecting the brain and spinal cord.

Her family confirmed the news in a statement, remembering her as a vibrant spirit who poured her passion into storytelling. She passed peacefully with her mother and aunt by her side.

A Passion for Performance From a Young Age

Born Kelley Lynne Klebenow on July 10, 1992, Mack grew up in various cities across the United States. She discovered her love for storytelling early after receiving a video camera as a birthday gift. That small gesture sparked a lifelong pursuit of acting and filmmaking.

As a child, she appeared in several commercials and later earned recognition from the Tisch School of the Arts for her performance in The Elephant Garden (2008), which also screened at the Tribeca Film Festival.

TV Appearances and Film Work

Many fans remember her as Addy, a Hilltop Colony member in The Walking Dead. She also had a guest role on 9-1-1 (2019) and played Penelope Jacobs in Chicago Med (2022).

Beyond TV, she contributed voice work as the Gwen Stacy voice match for Spider-Man: Into the Spider-Verse (2018) and voiced the character again for a 2024 Hyundai commercial.

She appeared in several films, including Broadcast Signal Intrusion (2021), Delicate Arch (2024), and Universal (2025), where she also served as executive producer.

Life Beyond the Screen

Mack graduated from Chapman University’s Dodge College of Film in 2014 with a degree in cinematography. She remained active in Los Angeles for over a decade, balancing her film work with commercial projects for major brands like Dr Pepper, Budweiser, Dairy Queen, and Chick-fil-A.

She and her mother co-wrote several screenplays, including On the Black, inspired by her grandparents’ college love story. In addition to her creative pursuits, she loved hiking, biking, piano, tennis, and fantasy football. Her family described her as a lifelong lover of animals, country music, and dark chocolate.

A Celebration of Her Life

Kelley is survived by her parents, Kristen and Lindsay; her sister Kathryn; her brother Parker; her grandparents Lois and Larry; and her boyfriend Logan.

A public remembrance will be held on August 16 at the Glendale Lyceum in Glendale, Ohio. A second celebration of her life will take place in Los Angeles at a later date.

As her sister Kathryn wrote, “Such a bright, fervent light has transitioned to the beyond. I am so proud of her.”

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More…

• https://www.hollywoodreporter.com/tv/tv-news/kelley-mack-dead-walking-dead-1236338124
• https://www.usatoday.com/story/entertainment/celebrities/2025/08/05/kelley-mack-dead-at-33-the-walking-dead/85533520007
• https://deadline.com/2025/08/kelley-mack-dead-walking-dead-911-actor-1236479460