Kelley Mack Cause of Death, Walking Dead Role, and Biography
When a familiar face from a beloved show disappears, it often takes a quiet announcement to remind us how much that character meant. Kelley Mack, best known for playing the determined Addy in The Walking Dead, passed away on August 2, 2025, at the age of 33 after a private battle with glioma, a rare brain cancer. Her family shared the news days later, sparking an outpouring of tributes and a deeper look at her life — from her early breakout to her final voice roles.
Born: July 10, 1992 ·
Died: August 2, 2025 ·
Age at Death: 33 ·
Known For: The Walking Dead (Addy) ·
Cause of Death: Glioma (brain cancer) ·
Occupation: Actress, producer, voice artist
Quick snapshot
- Died August 2, 2025, at age 33 (ABC News)
- Cause: glioma (The New York Times)
- Played Addy in The Walking Dead season 9 (Legacy.com)
- Real name: Kelley Lynne Klebenow (Biography.com)
- Exact duration of her illness not publicly disclosed (ABC News)
- Specific voice roles in Spider-Verse unconfirmed (Hindustan Times)
- Parents’ names not public (Biography.com)
- Education and early career details sparse (Legacy.com)
- Diagnosed with diffuse midline glioma in January 2025 (ABC News)
- Died at home in Cincinnati, Ohio, on August 2, 2025 (Today)
- Family announcement posted via Instagram on August 6, 2025 (ABC7 New York)
- Fan memorials and tributes continue on social media (Legacy.com)
- Her voice roles in the Spider-Man franchise may be remembered (HuffPost)
- No immediate estate or posthumous projects announced (ABC News)
Seven facts about Kelley Mack, one pattern: her public persona was bright, but her private battle with a rare cancer remained largely out of the spotlight until the very end.
| Label | Value |
|---|---|
| Full Name | Kelley Lynne Klebenow |
| Born | July 10, 1992, Cincinnati, Ohio, USA |
| Died | August 2, 2025 (age 33) |
| Occupation | Actress, producer, voice artist |
| Known For | Addy in The Walking Dead (season 9) |
| Cause of Death | Glioma (brain cancer) |
| Parents | Businessman father, real estate agent mother (names not public) |
The table reveals a life that reached millions through a single role, yet remained intensely private at home.
Why Did Kelley Mack Pass Away?
Kelley Mack died on August 2, 2025, at age 33, ABC News reported. Her family announced her passing on social media, stating she passed peacefully with her mother and aunt at her side.
How Long Did Kelley Mack Have Glioma?
- Mack had disclosed a diagnosis of diffuse midline glioma in January 2025, ABC News reported.
- According to Biography.com, she was diagnosed after persistent lower back pain, and an abnormal mass was found on her spine.
- The exact duration of her illness before diagnosis has not been publicly disclosed.
What Was Kelley Mack’s Cause of Death?
- The cause was glioma, a tumor of the central nervous system, according to The New York Times.
- Her agent, Julie Smith, confirmed the cause as glioma of the central nervous system, a rare form of astrocytoma cancer, HuffPost reported.
- Jackson Health describes diffuse midline glioma as a rare and aggressive tumor affecting the central nervous system.
Glioma remains one of the most difficult cancers to treat, with a five-year survival rate below 10% for aggressive forms. Mack’s case highlights the importance of early detection and research funding for rare brain tumors.
Who Was Kelley Mack in The Walking Dead?
Kelley Mack played Addy, a supporting character in season 9 of AMC’s post-apocalyptic zombie drama The Walking Dead, Legacy.com confirmed.
What Was the Name of Her Character?
- Her character was Addy, a member of the Hilltop community, a key settlement in the series.
- The role placed her among the survivors navigating a world overrun by walkers.
Which Season Did She Appear In?
- She appeared in season 9, which aired from 2018 to 2019, The New York Times noted.
- The role was her most widely recognized television credit.
Who Was Kelley Mack on 911?
Kelley Mack appeared in an episode of the Fox procedural drama 9-1-1, Hindustan Times reported. The specific character name is not widely documented in available sources.
What Role Did She Play on 911?
- The role was a guest appearance; details about the character are not publicly listed in authoritative databases.
- Her appearance on 9-1-1 added to her growing list of television credits.
The catch: Even minor roles on shows like 9-1-1 helped build the foundation of a career that was cut short.
What Movies and TV Shows Did Kelley Mack Appear In?
Beyond The Walking Dead and 9-1-1, Mack’s filmography includes voice work in the Spider-Man franchise, including the Spider-Verse films, HuffPost noted. She also appeared on Chicago Med, according to Hindustan Times.
What Voice Acting Roles Did She Have?
- Mack voiced characters in the Spider-Man franchise, though specific titles — such as whether she voiced Gwen Stacy — are not confirmed in the top search results, Biography.com listed her as a voice actress.
- Her IMDb profile, cited by Legacy.com, includes additional minor roles.
What Other TV Shows Did She Appear In?
- Chicago Med — one episode, role not specified.
- Additional credits on her IMDb page include short films and independent projects.
Who Are Kelley Mack’s Parents?
Kelley Mack’s real name is Kelley Lynne Klebenow, Biography.com confirmed. She was born in Cincinnati, Ohio, to a businessman father and a real estate agent mother. Their names have not been publicly disclosed.
What Is Kelley Mack’s Real Name?
- Her birth name was Kelley Lynne Klebenow.
- She used the stage name Kelley Mack professionally.
Where Was She Born?
- Cincinnati, Ohio, USA, ABC News reported.
- She died in the same city, according to Today.
Mack’s family kept her personal life — including her parents’ names — private, yet the public outpouring shows how deeply fans connect with actors who bring fictional characters to life.
Timeline of Kelley Mack’s Life and Career
- July 10, 1992 — Kelley Lynne Klebenow born in Cincinnati, Ohio.
- 2010s — Began acting career in minor roles (Legacy.com).
- 2018–2019 — Played Addy in season 9 of The Walking Dead (The New York Times).
- 2020s — Voice roles in Spider-Man franchise (HuffPost).
- January 2025 — Diagnosed with diffuse midline glioma (ABC News).
- August 2, 2025 — Died at age 33 in Cincinnati (Today).
- August 6, 2025 — Public announcement via family Instagram and news outlets (ABC7 New York).
What We Know and What Remains Unclear
Confirmed facts
- Date of birth: July 10, 1992
- Date of death: August 2, 2025
- Cause of death: glioma
- Role in The Walking Dead: Addy (season 9)
- Real name: Kelley Lynne Klebenow
- Birthplace: Cincinnati, Ohio
- Parents: businessman father, real estate agent mother
What’s unclear
- Exact duration of her battle with glioma
- Specific voice roles in Spider-Man (confirmation of Gwen Stacy)
- Names of parents
- Education and early career details
- Siblings or marital status
Quotes and Tributes
“It is with indelible sadness that we are announcing the passing of our dear Kelley. Kelley passed peacefully on August 2, 2025, with her mother and aunt at her side.”
— Family statement via Instagram, as reported by ABC News
“The Walking Dead actress Kelley Mack dies at 33 after battle with glioma.”
— ABC7 New York, ABC7 New York
“Mack’s agent confirmed she died from glioma of the central nervous system, a rare form of astrocytoma cancer.”
— HuffPost, HuffPost
For fans of The Walking Dead and the broader entertainment community, the loss of a young actress with a promising future is a stark reminder of the fragility of life. The decision to keep her illness private was her own, but the legacy she leaves — through Addy, through her voice roles, and through the quiet courage of her final months — is undeniable.
Related reading: **Natasha Richardson: Cause of Death, Skiing Accident & Legacy** · **Michael Gambon: Biography, Career, and Death of the Actor**
Frequently Asked Questions
How old was Kelley Mack when she died?
She was 33 years old. Born July 10, 1992, she died on August 2, 2025.
What was Kelley Mack’s real name?
Her real name was Kelley Lynne Klebenow.
Where was Kelley Mack born?
She was born in Cincinnati, Ohio, USA.
What was Kelley Mack’s first acting role?
Her first credited roles were in the 2010s, though specific early projects are not widely documented.
Did Kelley Mack have any siblings?
No information about siblings has been publicly disclosed.
What was Kelley Mack’s net worth?
Her net worth has not been publicly reported.
Was Kelley Mack married?
No public information about a spouse or marriage has been found.
What other TV shows did Kelley Mack appear in besides The Walking Dead?
She appeared in 9-1-1 and Chicago Med, and had voice roles in the Spider-Man franchise.
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