Tatum Riley is a character appearing in Scream portrayed by Rose McGowan. She is seventeen years old, a senior in high school, and one of the most popular girls in Woodsboro High School. She is also the younger sister of Dewey Riley and the best friend of Sidney Prescott in Woodsboro since childhood. She was the girlfriend of Woodsboro High student, Stu Macher, who was the accomplice killer to Sidney's murderous boyfriend, Billy Loomis. She was killed in the Macher's residence garage by Billy Loomis and her body was later discovered by Sidney. Her death heavily affected both Dewey and Sidney.