Jack the Ripper
We call him “Jack the Ripper,” but we don’t really know who the person behind one of the older and most notorious murder sprees was. The killer appeared in London’s Whitechapel district in 1888 and murdered five women—all prostitutes—and mutilated their corpses. Police surmised the killer was a surgeon, butcher, or someone skilled with a scalpel. The killer mocked the community and the police by sending letters outlining the acts. Although many suspects have been named over the years, the killer has never been identified.