Whitechapel is a series that depicted a killer who was copying the actions of which unidentified serial killer?
Whitechapel (TV series):  The first series was first broadcast in the UK on 2 February 2009 and depicted the search for a modern copycat killer replicating the murders of Jack the Ripper. Jack the Ripper: Jack the Ripper is the best-known name for an unidentified serial killer generally believed to have been active in the largely impoverished areas in and around the Whitechapel district of London in 1888.
Jack the Ripper