Gilpin County deputy posed as a girl as he corresponded with a Harvard librarian seeking sex. ... Yahya Hussein Ahmad Melhem, 47, was arrested for investigation of attempted sexual exploitation of a child, Internet sexual exploitation of a child, Internet luring of a child and attempted child sexual assault, all felony charges. ... Melhem wrote a message asking the "girl" to show him "her intimate body parts via webcam." He also displayed sexually graphic video of himself to the deputy believing he was a girl.