Dubbed ‘The Ken and Barbie Killers’ for their blonde, tanned and seemingly wholesome image, Paul Bernardo and Karla Homolka were in fact a husband and wife team of serial killers from Ontario, Canada. Their trials and subsequent convictions for raping and murdering three teenage girls engendered a global media storm. Alarmingly, amongst their victims was Karla’s younger sister, 15-year-old Tammy Homolka. Karla served her full sentence of 12 years whilst Paul is currently in prison for life.