Answer:
Jack The Ripper is an unidentified serial killer most active in London's impoverished east end, or the Whitechapel district. Beginning in the spring of 1888, JTR killed between 5 and 13 women*, cutting their throats first and then disemboweling and mutilating them, and then slipping into the night and disappearing. The killer was never identified.
*The number of victims is still hotly debated but the total is most likely closer to 13 than to 5.