Jack the Ripper was an unidentified serial killer active in Whitechapel, London in 1888 who murdered at least five people, mostly women. The killer was nicknamed "Jack the Ripper" after a letter claiming to be from the killer was published, though the letter is now believed to be a hoax. The document provides background on the killer, listing their unknown birth name, nicknames of "Jack the Ripper", "The Whitechapel Murderer" and "Leather Apron". It also includes a map showing the locations in Whitechapel where the murders took place.