The Walking Dead Actress Kelley Mack’s Cause of Death Revealed

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Kelley Mack’s family is sharing more details about her untimely death.

Two days following the disclosure of the passing of a former cast member from “The Walking Dead,” who portrayed Addy in season nine on AMC, her family confirmed in a statement to The New York Times on August 6th that she succumbed to an aggressive brain tumor.

One day prior, Kelley’s sister Kathryn shared that she died on Aug. 2 at age 33.

With profound sorrow, we announce the death of our beloved Kelley. A brilliant and passionate soul has moved on, leaving us for a place where we will all ultimately journey.”

This sentence maintains the same meaning as the original but uses simpler language and a more conversational tone to make it easier to read.

Before her unfortunate demise, it was disclosed that Kelley (her real name being Kelley Lynne Klebenow) had been fighting against a rare form of brain cancer known as diffuse midline glioma. This type of tumor specifically grows in the central parts of the brain, including areas like the brainstem, thalamus, and spinal cord, as per the Mayo Clinic’s description.

During her battle with cancer, she had a challenging operation that necessitated her learning to walk again.

In a January Instagram post, Kelly shared a photo of herself beaming from a hospital bed. She explained that following surgery on her spinal cord for a biopsy, she has experienced loss of function in her right leg and significant loss in her left leg. As a result, she now navigates using a walker and a wheelchair.

Two months later, the 9-1-1 alum shared she had been making progress on moving around on her own. 

She mentioned, in relation to a recent Instagram video featuring her and her boyfriend Logan, that she’s climbed these stairs twice over the past few days. She expressed that this is significant for her, considering the various challenges she’s been facing in her life lately. (In other words, isn’t it true that life has had its highs and lows recently?)

After her sister’s demise, Kathryn pondered over the influence her sister still exerts on people around her.

Kathryn explained that Kelley had appeared to several of her dear ones, taking the shape of different butterflies,” she went on. “Her absence will be deeply felt by numerous people in a way that language fails to capture.

Read on for a look back at Kelley’s life in photos. 

At the Chicago Film Festival in 2021, Kelley marked the debut of her film titled “Broadcast Signal Intrusion.

kelley frequently shared both her personal and professional achievements on social media platforms, keeping her followers informed about her private life.

Many of Kelley’s posts included her boyfriend, Logan. 

The actress known for her role in “9-1-1” regularly shared updates about her personal battle against diffuse midline glioma, an uncommon type of cancer, with her followers.

Kelly collaborated with her mom on writing screenplays, which included “On the Black” – a 1950s-set production inspired by the life stories of Kelly’s great-grandparents.

Beyond “Broadcast Signal Intrusion”, Kelley additionally featured in “The Walking Dead” as a character named Addy. Furthermore, Kelley has also played guest roles on shows like “9-1-1” and “Chicago Med”.

Kelley also did voiceover work, often sharing glimpses of the recording process.

The 33-year-old’s family were by her side throughout her health journey. 

In the spring, Kelley enjoyed a trip to Florida to spend time with family.

Of Logan, Kelley wrote, “My love, always by my side.”

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2025-08-07 03:47