The Walking Dead actress Kelley Mack – who was best known for playing the role of Addy in the zombie drama – has died aged 33 after being diagnosed with cancer last year

The Walking Dead star Kelley Mack has died at the age of 33 after being diagnosed with a rare form of cancer. The actress was best known for playing the role of Addy in the popular zombie drama.

Her death was announced in a post on her Instagram page, which read: “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. Kelley has already come to many of her loved ones in the form of various butterflies. She will be missed by so many to depths that words cannot express.”


Kelly Mack was best known for her role in The Walking Dead
Kelley previously announced that she had been diagnosed with a rare form of cancer in September and was undergoing aggressive treatment as a result. Kelley played Addy in five episodes of The Walking Dead in 2018 but had also appeared in 9-1-1, Chicago Med and TV film Mr. Manhattan.

The young star had also starred in 2021 horror film Broadcast Signal Intrusion alongside Glee’s Harry Shum Jr and This Is Us star Chris Sullivan. Her brother is fellow actor Parker Mack, who is best known for his roles in Ouija: Origin of Evil, Faking It and Divergent.

Kelley had recently starred in the film Universal alongside The Inbetweeners’ star Joe Thomas and Buffering’s Rosa Robson. Kelley had been recovering from cancer treatment earlier in the year, posting in March that she had finished proton radiation treatment and was undergoing physical therapy.

“Overall, this journey has not been easy, but things are getting better — improvements are tough to see when you’re in the thick of it. Thank you again and again for the support and prayers,” she wrote on Instagram at the time.

Fans have taken to social media to post tributes to Kelley, with one writing: “How terribly sad. Thoughts go out to her loved ones.” A second tweeted: “Oh no. Loved her in Broadcast Signal intrusion. Rest in Peace Kelley.”

A third wrote: “Kelley Mack, who played Addy on The Walking Dead Passed Away. This is so sad and so young.”