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She was overly friendly. >> reporter: joyce was particularly friendly with the cop-killer david sweat. >> good worker? >> very good worker. >> reporter: sweat had been promoted to instructor teaching inmates how to sew. which landed him the top prison wage, 40 cents an hour. the position also put him in a close professional relationship with joyce. then she allowed their relationship to become personal. she says that was natural. >> when youre working with your instructor, its like your right-ha...