‘The Walking Dead’ Actress Kelly Mack Dies at 33 After Battle with Glioma: What Is Glioma?

The entertainment world was struck with sadness this week as news broke of the passing of actress Kelly Mack, best known for her role as Addy in AMC’s hit television series “The Walking Dead.” Mack was just 33 years old and had been privately fighting a serious illness. According to statements from her family and representatives, the beloved actress’s cause of death was a brain tumor known as glioma. As fans mourn her loss, many have questions regarding the disease that claimed her young life.

Who Was Kelly Mack?

Kelly Mack made a notable mark on television during her recurring role as Addy, a survivor and member of the Highwaymen community, in the ninth season of “The Walking Dead.” Born in 1990, Mack trained in theatre and film, combining her talents as an actress, writer, and producer. Beyond her appearances in “The Walking Dead,” she worked on several indie film projects and built a supportive fanbase.

Friends, fellow cast members, and fans paid tribute to Mack for her passion for acting, vibrant spirit, and selfless advocacy for health causes—even as she quietly fought her own health battles.

What Is Glioma?

The cause of Mack’s untimely death, glioma, is a type of brain tumor that arises from glial cells. These cells are supportive cells in the brain that surround and provide insulation between neurons. Gliomas account for about 30 percent of all brain and central nervous system tumors, and about 80 percent of all malignant brain tumors.

Types of Glioma

Glioma is not a single disease but rather a group of cancers categorized by the type of glial cell they originate from. The main types include:

• Astrocytomas: Develop from star-shaped glial cells known as astrocytes.
• Oligodendrogliomas: Originate from oligodendrocytes, which support nerve cells.
• Ependymomas: Begin in ependymal cells lining the brain’s ventricles.

Often, the term “glioblastoma” is used to denote the most aggressive form, called glioblastoma multiforme (GBM).

Symptoms of Glioma

Symptoms depend on the tumor’s size, type, and location in the brain, but common signs may include:

• Persistent headaches
• Seizures
• Nausea and vomiting
• Changes in vision or speech
• Personality or cognitive changes
• Weakness or numbness in limbs

Many of these symptoms can be mistaken for other conditions, sometimes delaying diagnosis.

Causes and Risk Factors

The exact cause of gliomas is still not entirely understood. Factors that may increase risk include:

• Age: Gliomas are more common in adults between 45 and 65, but they can occur at any age.
• Radiation exposure: Previous radiation to the head, often for other cancers, can elevate risk.
• Genetic factors: Some rare genetic disorders (such as neurofibromatosis) can increase susceptibility.

Diagnosis and Treatment

Diagnosis of gliomas typically involves neurological exams, imaging tests such as MRI or CT scans, and often a biopsy to determine the exact tumor type and grade.

Treatment plans depend on the tumor’s size, location, growth rate, and the patient’s overall health. Standard treatments include:

• Surgery: Attempting to remove as much of the tumor as possible.
• Radiation therapy: Targeted x-rays to kill remaining cancer cells.
• Chemotherapy: Medications to destroy or stop cancer growth.
• Targeted drug therapies: For certain genetic mutations, newer drugs may be used.

Despite advances, gliomas—especially high-grade ones like glioblastoma—are difficult to cure, and research into new treatments is ongoing.

Remembering Kelly Mack

Kelly Mack’s battle with glioma was private, echoing the resilience of many patients who face this grim diagnosis with quiet courage. Her passing at such a young age is a stark reminder of the indiscriminate nature of cancer. Mack will be remembered not only for her artistic contributions but also for her bravery and the affection she inspired in friends, colleagues, and fans.

The loss also shines a light on the need for continued research into brain tumors and greater support for those affected by glioma and other forms of brain cancer.

Conclusion

Glioma is a serious and complex disease that affects thousands each year, and Kelly Mack’s battle reminds us of its heartbreaking human cost. As tributes continue to pour in for the late actress, her memory can help inspire increased awareness, research, and hope for future breakthroughs in treating this devastating illness.

If you or someone you know is experiencing persistent neurological symptoms such as severe headaches or unexplained changes in behavior, consult a medical professional for evaluation.

Rest in peace, Kelly Mack. Your talent and spirit will not be forgotten.