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.

"The Walking Dead" and "Chicago Med" actress died on Saturday at the age of 33, her sister said in a heartbreaking statement.

After Kelley Mack died at age 33 following a battle with cancer, her Walking Dead costars paid tribute to the late actress.