Kelley Mack played Addy in Season 9 of TWD, but her talent extended far beyond one role — she brought depth and fire to every character she touched.
Before The Walking Dead or Chicago Med, Kelley made her mark in short films and indie projects, earning a loyal following for her raw, emotional performances.
Kelley wasn't just an actress — she was also a writer and creative. Friends say she journaled religiously and dreamed of writing and directing one day.
Kelley appeared in 9-1-1 (FOX), delivering a powerful scene that sparked conversations online. Many fans say they only realized it was her after her passing.
Another memorable role was Penelope Jacobs in Chicago Med, where her portrayal of a trauma survivor hit viewers hard — and now feels even more significant.
Fans revisited her final posts after her death, realizing subtle signs of her emotional strength and vulnerability. She never mentioned her illness publicly.
Many didn’t realize she had been quietly fighting a deadly illness. Her story is a reminder of how fragile life can be.
Kelley passed away after a private battle with glioma — a rare, aggressive brain tumor that affects the central nervous system. She kept it out of the spotlight to protect her peace.