|Dates||???? - 2007 (killed by Sam Winchester)|
|Episode(s)||3.04 Sin City|
You don't get it. All you got to do is nudge humans in the right direction. Some whiskey here, a hooker there, and they'll walk right into Hell with big, fat smiles on their faces. Your kind is corrupt, Dean. Weak. Our will's stronger. That's why we'll win.
– Casey, 3.04 Sin City
After being possessed by the demon, 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.
While Dean berates Sam for stopping him from killing Ruby, Sam defends himself by explaining how Dean didn't want him to kill Casey. But Dean explains that Casey wasn't manipulating him like Ruby.