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Katherine Evelyn Anita Cassidy (formerly Cassidy Rodgers; born November 25, 1986) is an American actress. Following several minor television roles, she came to attention as a scream queen after starring in the horror films When a Stranger Calls (2006), as Kelli Presley in Black Christmas (2006) and as Ruby in the third season of the horror series Supernatural (2007–2008). Wikipedia