The Brief

Kelley Mack, the actress who played "Addy" in season 9 of "The Walking Dead," has died. She was 33 years old.

Her family announced her death on Mack’s Instagram page. Her real name was Kelley Klebenow.

Kelley Mack’s death

Mack died of an aggressive glioma, or tumor, that attacked her central nervous system, her family said.

What they're saying:

"It is with indelible sadness that we are announcing the passing of our dear Kelley," her sister posted on Mack’s Instagram page. "Such a bright, fervent light has transitioned to the beyond, where we all eventually must go. Kelley passed peacefully on Saturday evening with her loving mother Kristen and steadfast aunt Karen present. Kelley has already come to many of her loved ones in the form of various butterflies. She will be m

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