1. The Acid Bath Murderer

John George Haigh was a murderer in the UK in the 1940s who thought he could avoid getting caught if there were no bodies — so he dissolved his victims in baths of acid. Unfortunately, there was still quite a bit of evidence to prove he killed six people, so he was executed.

2. The Reinert Murders

In June 1979, Pennsylvania high school principal Jay C. Smith murdered his coworker, Susan Reinert. Her body was found weeks later in her car. Her kids went missing too, but their bodies were never found. Smith was believed to be conspiring with Reinert's boyfriend of the time to inherit Reinert's life insurance.

3. Erzsébet Báthory

Also known as "The Blood Countess" in the 1600s, Báthory is often referred to as the most prolific female serial killer OF ALL TIME. She killed over 650 young women with the help of four other people, and would bathe in the blood of virgins to stay young. Well, shit.

4. Murder of Junko Furuta

In November 1988, 17-year-old Junko Furuta was kidnapped by four boys and held hostage in one of their homes in Tokyo. After beating, raping, and torturing her for 44 days, the boys tossed her lifeless body into a giant drum filled with concrete. Just awful.

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