When most people think of serial killers, they think of a man. While there are female serial killers, the majority of the most notorious murderers are men. However, the women who have become infamous for their crimes are also some of the worst killers to have ever existed. Karla Homolka is one of those women, who gained notoriety in the early '90s when she and her partner Paul Bernardo were arrested for raping and murdering a slew of women, one of which was Karla’s very own sister. After serving 12 years in prison, Karla is now free and living with a family of her own under an alias, while Paul is up for parole and could be released from prison within the year.