• Video
  • Shop
  • Culture
  • Family
  • Wellness
  • Food
  • Living
  • Style
  • Travel
  • News
  • Book Club
  • Newsletter
  • Privacy Policy
  • Your US State Privacy Rights
  • Children's Online Privacy Policy
  • Interest-Based Ads
  • Terms of Use
  • Do Not Sell My Info
  • Contact Us
  • © 2026 ABC News
  • Culture

'The Walking Dead' actress Kelley Mack dies at 33

0:37
Amanda Edwards/Stringer/Getty Images
'The Walking Dead' actress Kelley Mack dies at 33
Amanda Edwards/Getty Images
ByYi-Jin Yu
August 06, 2025, 1:13 PM

Kelley Mack, an actress best known for her work on the horror series “The Walking Dead,” has died at age 33.

A representative for Mack confirmed her death to ABC News and said in a statement, “She will be so missed.”

Actress Kelley Mack arrives at the Los Angeles Friends + Family Premiere of Dark Sky Films and Queensbury Pictures' "Broadcast Signal Intrusion" at iPic Theaters on October 19, 2021 in Los Angeles, California.
Amanda Edwards/Getty Images

In an online statement, Mack's family said she died on Aug. 2 with her mother and aunt at her side following a battle with a glioma, a type of tumor of the central nervous system.

“It is with indelible sadness that we are announcing the passing of our dear Kelley,” Mack's family wrote in the statement, and also called her “a bright, fervent light.”

“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,” the statement added.

In a January Instagram post, Mack revealed that after experiencing "persistent lower back pain" as well as "shooting pains in my legs and back," she had been diagnosed with diffuse midline glioma, which she described as "an extremely rare type of astrocytoma cancer."

"Due to the biopsy surgery on my spinal cord, I have lost the use of my right leg and most of my left leg, so I now get around with a walker and a wheelchair," she added.

According to the National Cancer Institute, diffuse midline gliomas are tumors that start in the primary central nervous system, such as in the brain or spinal cord, and are "a rare subtype of glial tumors."

The National Cancer Institute estimates that approximately 3,940 people live with diffuse midline gliomas in the U.S. Symptoms may include double vision, swallowing problems, and a loss of balance or weakness on one or both sides of the body.

People with diffuse midline gliomas may be treated with surgery, chemotherapy, radiation or targeted medications, according to the National Cancer Institute, which says the relative five-year survival rate is 42.2 percent. Survival depends upon many factors, including an individual's age and the grade of the tumor.

As an actor, Mack portrayed Addy during the ninth season of “The Walking Dead” and Penelope Jacobs in the eighth season of “Chicago Med,” which will return for its 11th season this fall. She was also known for her role as Alice in the horror film “Broadcast Signal Intrusion.”

Related Articles

Bride shares magic of butterfly to honor late father during her wedding

Born Kelley Klebenow, Mack was a Cincinnati, Ohio, native and grew up in Ohio, North Carolina and Illinois, according to her family. She graduated from Chapman University in 2014 and lived and worked in Los Angeles for the past decade. She was the oldest of three children, including her sister, Kathryn, and brother Parker Mack, who is also an actor.

Related Articles

Jeffrey Dean Morgan talks about his 'Walking Dead: Dead City' family and more

In addition to acting, Mack was also a producer, writer and voiceover artist.

Editor’s Picks

Black Sabbath frontman Ozzy Osbourne dead at 76

  • Jul 22, 2025

Influencer Tanner Martin announces his own death at 30

  • Jun 26, 2025

Mack’s family said a “recognition and remembrance” of life for Mack will be held Aug. 16 in Glendale, Ohio, and that another celebration of life will be held in Los Angeles at a date yet to be determined.

Related Topics

  • Obituaries

Editor’s Picks

Black Sabbath frontman Ozzy Osbourne dead at 76

  • Jul 22, 2025

Influencer Tanner Martin announces his own death at 30

  • Jun 26, 2025

Up Next in Culture—

British royals commemorate Queen Elizabeth II's 100th birthday

April 21, 2026

Anne Hathaway, Meryl Streep make 'Devil Wears Prada 2' press tour their runway

April 20, 2026

Sandra Bullock, Nicole Kidman return as the Owens sisters in 'Practical Magic 2' teaser

April 20, 2026

'Melrose Place,' 'Days of Our Lives' star Patrick Muldoon dies at 57

April 20, 2026

Shop GMA Favorites

ABC will receive a commission for purchases made through these links.

Sponsored Content by Taboola

The latest lifestyle and entertainment news and inspiration for how to live your best life - all from Good Morning America.
  • Contests
  • Terms of Use
  • Privacy Policy
  • Do Not Sell My Info
  • Children’s Online Privacy Policy
  • Advertise with us
  • Your US State Privacy Rights
  • Interest-Based Ads
  • About Nielsen Measurement
  • Press
  • Feedback
  • Shop FAQs
  • ABC News
  • ABC
  • All Videos
  • All Topics
  • Sitemap

© 2026 ABC News
  • Privacy Policy— 
  • Your US State Privacy Rights— 
  • Children's Online Privacy Policy— 
  • Interest-Based Ads— 
  • Terms of Use— 
  • Do Not Sell My Info— 
  • Contact Us— 

© 2026 ABC News