Actress and producer Kelley Mack, known for her work in hit series like T he Walking Dead, Chicago Med, and more, has passed at 33 following a battle with a glioma, ABC r eports.

Kelley Mack, who portrayed Addy in Season 9 of The Walking Dead, has died at the age of 33. Her family announced that Mack passed away on Aug. 2 in her hometown of Cincinnati following a diagnosis of glioma of the central nervous system.

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.