In the early 1990s, Canada was horrified by the crimes of Paul Bernardo and Karla Homolka, a couple whose outward charm masked sadistic violence. Bernardo, already known as the “Scarborough Rapist” for a string of assaults in Toronto, escalated his crimes after meeting Homolka. Together, they kidnapped, drugged, and sexually assaulted young women — including Karla’s own sister, Tammy Homolka, who died after being drugged at a family gathering in 1990. Their most infamous crimes were the murders

Karla Homolka was released in 2005 as part of a controverisal plea deal. But the tapes found inside her home shattered any illusion that she was an unwilling victim in these heinous acts. Watch the second part of "Ken And Barbie Killers: The Lost Murder Tapes" tonight at 9/8c and streaming on discovery | Investigation Discovery