 Traditionally , five murders ( known as the " canonical five " ) are attributed to the notorious serial killer " Jack the Ripper " , who terrorised Whitechapel in the East End of London between August and November 1888 . Authorities are not agreed on the exact number of the Ripper 's victims , and at least eleven Whitechapel murders between April 1888 and February 1891 were included in the same extensive police investigation . All the crimes remain unsolved . 
