Kelley Mack’s death on Aug. 2 at age 33 was "very unexpected," her rep tells PEOPLE. The 'Walking Dead' actress was still auditioning in June despite her cancer diagnosis and her agents were "totally surprised" by the news.

A rep for Kelley Mack shared The Walking Dead actress’ death came as a shock, having been auditioning her for new roles just two months earlier.

Kelley Mack, best known for her role as Addy in "The Walking Dead," has died at the age of 33 after a difficult fight with brain cancer. Her sister, Kathryn Klebenow, announced the sad news on Tuesday through Mack's Instagram.