Alexander McCartney, a notorious online sex offender from Northern Ireland, utilized the photographs of his victims, including a teenage girl named Emily from Oregon, to deceive and exploit other young girls. Targeting minors through fake online profiles, McCartney coerced victims into sending explicit images, leading to severe emotional trauma. Following a 20-year jail sentence for numerous sex offenses and the manslaughter of 12-year-old Cimarron Thomas, the case highlights the urgent need for awareness and reporting of online abuse. A BBC Three documentary, ‘Teen Predator/Online Killer,’ explores this widespread issue through the voices of the affected.