Paul Bernardo and Karla Homolka were a Canadian couple who committed a series of shocking crimes in the 90s.
They tortured, raped and murdered three girls, including Karla's younger sister.
Homolka made a deal with the investigation, giving up Bernardo, and received only 12 years.
Paul was given life without parole.
Homolka was released in 2005 and lives freely.