Friends and fans of Kelley Mack are mourning the loss of a talented actress whose battle with a rare brain tumor brought a quiet kind of bravery to a very public fight. At just 33, Mack died on August 2, 2025, from complications of diffuse midline glioma, a condition few had heard of until her family shared the news.

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Age at death: 33 ·
Date of death: August 2, 2025 ·
Cause of death: Complications from diffuse midline glioma ·
Known for: Addy in The Walking Dead (season 9) ·
Born: July 10, 1992 ·
Birthplace: Cincinnati, Ohio

Quick snapshot

1Confirmed facts
2What’s unclear
  • Exact date of diagnosis with diffuse midline glioma
  • Whether she appeared on Chicago Med and the character name
  • Role in a Spider-Man movie (no evidence found)
3Timeline signal
  • 2024 (estimated): diagnosed with diffuse midline glioma
  • August 2, 2025: passes away at home with family
  • August 4, 2025: family announces death on Instagram
4What’s next

Eight verified facts cover the basics of Kelley Mack’s life and death, one pattern: the public record is solid on her final illness and career highlight, but thinner on earlier TV credits and personal details.

Label Value
Full name Kelley Lynne Klebenow
Date of birth July 10, 1992
Date of death August 2, 2025
Cause of death Complications from diffuse midline glioma
Occupation Actress, producer, voice-over artist
Years active 2010–2025 (approx)
Notable work The Walking Dead (Addy)
Birthplace Cincinnati, Ohio

What Did Kelley Mack Pass Away From?

Official Cause of Death

  • Kelley Mack died on August 2, 2025, at age 33 from complications of diffuse midline glioma (Jackson Health System (hospital & research system)).
  • Diffuse midline glioma is a rare and aggressive tumor of the central nervous system, classified as a WHO grade 4 glioma (Jackson Health System).

The implication: This is not a common adult cancer. DMG primarily affects children and young adults, making Mack’s case part of a small but devastating cohort.

Family Announcement on Social Media

  • Her family announced her passing via Instagram, stating she died peacefully on the evening of August 2 with her mother Kristen and aunt Karen present (Instagram (Mack’s official account)).
  • A secondary report says the family expressed deep sadness and thanked fans for support (YouTube news report).

The pattern: The family chose to share the news directly on her own platform, a now-common but deeply personal way to reach her community.

Kelley Mack’s death from diffuse midline glioma exposed a rare disease to a wide audience, shifting public focus from her acting to the aggressive tumor that cut her life short.

What Kind of Glioma Did Kelley Mack Have?

Definition of Diffuse Midline Glioma

  • Diffuse midline glioma is a primary central nervous system tumor, not a metastatic disease (Jackson Health System).
  • Mack described it herself as an “extremely rare type of astrocytoma cancer” on Instagram (Instagram).
  • Biopsy surgery on her spinal cord resulted in loss of use of her right leg, according to her own social media (Instagram).
The trade-off

For patients like Mack, aggressive treatment may extend survival but often at the cost of mobility and quality of life — her Instagram post about losing leg function illustrates that trade-off directly.

How This Tumor Affected Kelley Mack

  • Exact diagnosis timeline is not publicly confirmed, but estimated at 2024 based on her social media activity (Instagram).
  • The tumor’s location in the midline (brainstem, thalamus, spinal cord) makes surgical removal difficult (Jackson Health System).

Why this matters: Mack’s public openness about her diagnosis — including the spinal biopsy and its aftermath — gave many their first real look at how DMG progresses in a young adult.

What Movie Did Kelley Mack Play in Spider Man?

The Spider-Man Role in Question

  • Kelley Mack was not cast in any Spider-Man film. No verifiable source connects her to the franchise.
  • The confusion may stem from Kirsten Dunst’s role as Mary Jane Watson in Sam Raimi’s trilogy, or from a similar-sounding name.

Clarification: Kelley Mack Did Not Play Mary Jane Watson

  • Her known film and TV credits — independent films, voice projects, TV guest spots — do not include the Spider-Man franchise (YouTube news report).
  • This appears to be a persistent internet rumor with no supporting evidence.

The catch: Without a credited role, the Spider-Man association is likely a misattribution by fans or automated systems. It remains in the “unclear” column.

Who Did Kelley Mack Play on Chicago Med?

Unconfirmed Role on Chicago Med

  • Kelley Mack is listed as having a role on Chicago Med, but the character name is not publicly documented in the provided sources (YouTube news report).
  • Her IMDb profile indicates guest star appearances, but full episode details require additional verification.

Partial Credits from Available Sources

  • Further verification is needed to identify the specific episode or character.
  • This gap underscores the incomplete public record for mid-level TV guest roles.

What this means: While multiple outlets mention Chicago Med, the lack of a confirmed character name means readers should treat the credit as unverified.

What Role Did Kelley Mack Play on The Walking Dead?

The Character Addy in Season 9

  • Kelley Mack played Addy in season 9 of The Walking Dead (YouTube news report).
  • Addy was a background character in the Whisperer storyline, appearing in the post-apocalyptic narrative.

Significance of Her Appearance

  • This is her most recognized acting credit and the one most frequently cited in obituaries.
  • Her role, while small, contributed to the texture of the show’s ninth season.

The implication: For many viewers, Addy was their first encounter with Mack, and her death has prompted a renewed appreciation for that brief performance.

Timeline

  • July 10, 1992 — Born in Cincinnati, Ohio
  • 2010–2025 — Acting career (independent films, TV guest spots, voice work)
  • 2024 (estimated) — Diagnosed with diffuse midline glioma (Instagram)
  • August 2, 2025 — Died at home at age 33 (Instagram)
  • August 4, 2025 — Family announces death publicly (Instagram)
  • August 5–6, 2025 — Tributes from fans and media outlets (Jackson Health System, YouTube)

Why this matters: The timeline shows how quickly the news moved from a private family moment to a public conversation about rare brain tumors.

Clarity: What’s Confirmed vs. What’s Unclear

Confirmed facts

  • Died August 2, 2025, at age 33 (Jackson Health System)
  • Cause: complications from diffuse midline glioma (Jackson Health System)
  • Played Addy on The Walking Dead season 9 (YouTube)
  • Born July 10, 1992, in Cincinnati, Ohio
  • Family announced death on Instagram (Instagram)

What’s unclear

  • Exact date of diagnosis with diffuse midline glioma
  • Whether she had a confirmed role on Chicago Med and the character name
  • Any connection to Spider-Man films (no evidence)
  • Full list of acting credits (partial from IMDb)
  • Personal relationship status
Why this gap matters

The incomplete record on Chicago Med and the baseless Spider-Man rumor show how quickly misinformation can fill holes in a public figure’s biography, even in the days following her death.

Voices: What Family and Experts Said

“It is with indelible sadness that we are announcing the passing of our dear Kelley.”

— Family statement via Instagram (Mack’s official account)

“Diffuse midline glioma is a rare and aggressive tumor affecting the central nervous system.” L’actriu Kelley Mack, de 33 anys, ha mort a causa d’un glioma de línia mitjana difús, segons la programació de tardor de la CBS per al 2025. La programació de tardor de la CBS per al 2025

— Jackson Health System (research hospital)

The pattern: The family’s grief was shared with raw honesty, while medical sources provided the clinical context that helped the public understand the disease.

Summary

Kelley Mack’s death at 33 from diffuse midline glioma put a human face on a rare pediatric brain tumor that most adults will never encounter. Kelley Mack’s story underscores that early symptom awareness and candid discussion about treatment trade-offs can make the difference between isolation and support for young actors and their families facing a similar diagnosis.

Additional sources

facebook.com

Fans remember Kelley Mack for her role as Addy on The Walking Dead, and Kelley Mack Walking Dead actress dies offers an in-depth tribute to her life and career.

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Frequently asked questions

How did Kelley Mack die?

She died from complications of diffuse midline glioma on August 2, 2025, at age 33 (Jackson Health System).

What is diffuse midline glioma?

A rare, aggressive brain tumor that grows in midline structures of the central nervous system and is classified as WHO grade 4 (Jackson Health System).

How old was Kelley Mack at her death?

33 years old (Jackson Health System).

Where was Kelley Mack born?

Cincinnati, Ohio.

When did Kelley Mack die?

August 2, 2025.

How did Kelley Mack’s family announce her death?

Via her Instagram account, stating she died peacefully with family present (Instagram).

What other TV shows did Kelley Mack appear in?

She reportedly had a guest role on Chicago Med, but the character and episode are not confirmed. She also voiced in independent projects (YouTube).

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