The Walking Dead family has tragically lost a member. It's with heavy hearts we report Kelley Mack, who memorably played Addy in season 9 of the AMC horror series, has died at just 33 years old. Her family announced she passed on August 2 in a statement shared on her official Instagram account: "It is with indelible sadness that we are announcing the passing of our dear Kelley. 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.