In Elizabethville, Ohio, Casey is a bartender at Trotter's Bar. She is possessed by one of the demons let loose when the Devil's Gate in Wyoming was opened.
She prompted Trotter to introduce gambling and prostitution to the town, thereby encouraging vice amongst the inhabitants. She seduces a hunter, Richie, and then kills him. When she tries the same plan with Dean, he traps her with a Devil's trap. She uses her power to thwart his exorcism, and then traps him in the basement with her by causing a cave-in at the entrance.