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.

Kelley Mack’s death shocked her loved ones. Mack’s rep told TMZ Thursday that the “Walking Dead” star’s passing at age 33 was a “total” surprise. Mack, according to her rep, was auditioning for roles earlier this summer after she underwent cancer treatment in February and experienced a “nice recovery.”

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.