After Tomas decides he must help the Rances, he investigates a strange noise in their attic. He witnesses a rat being supernaturally killed and is briefly confronted by a possessed Casey , though she quickly reverts to a "normal" state when her mother arrives.
Angela’s younger daughter, who initially seems normal but is revealed to be the true target of the possession. Key Story Developments [S1E1] The Exorcist
Recently returned from a car accident that killed her friend; she is withdrawn and erratic. After Tomas decides he must help the Rances,
Suffering from early-onset dementia or cognitive impairment. [S1E1] The Exorcist