Question: Whitechapel is a series that depicted a killer who was copying the actions of which unidentified serial killer?

full_context: Document 1: Spring-heeled Jack: Spring-heeled Jack is an entity in English folklore of the Victorian era. The first claimed sighting of Spring-heeled Jack was in 1837. Later sightings were reported all over Great Britain and were especially prevalent in suburban London, the Midlands and Scotland.
Document 2: 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. The name "Jack the Ripper" originated in a letter written by someone claiming to be the murderer that was disseminated in the media. The letter is widely believed to have been a hoax and may have been written by journalists in an attempt to heighten interest in the story and increase their newspapers' circulation. In both the criminal case files and contemporary journalistic accounts, the killer was called "the Whitechapel Murderer" and "Leather Apron".
Document 3: Mary Ann Nichols: Mary Ann "Polly" Nichols (née Walker; 26 August 1845 – 31 August 1888) was one of the Whitechapel murder victims. Her death has been attributed to the notorious unidentified serial killer Jack the Ripper, who is believed to have killed and mutilated at least five women in the Whitechapel area of London from late August to early November 1888.
Document 4: Whitechapel murders: The Whitechapel murders were committed in or near the impoverished Whitechapel district in the East End of London between 3 April 1888 and 13 February 1891. At various points some or all of these eleven unsolved murders of women have been ascribed to the notorious unidentified serial killer known as Jack the Ripper.
Document 5: Silent Witness: Silent Witness is a British television crime drama series, produced by the BBC, which focuses on a team of forensic pathology experts and their investigations into various crimes. First broadcast in 1996, the series was created by Nigel McCrery, a former murder squad detective based in Nottingham. He later went on to create the hit series "New Tricks", with writer Roy Mitchell. Since 1996, twenty series of the programme have been broadcast. Amanda Burton originally starred as primary character Dr. Sam Ryan, before leaving the show during the eighth series. Since, the series has featured more of an ensemble cast, currently consisting of Emilia Fox, David Caves, Liz Carr and Richard Lintern. The programme is broadcast in more than 235 territories, including ABC in Australia, Showcase and the Knowledge Network in Canada, KRO in the Netherlands, TV One and Prime in New Zealand, and BBC America in the United States. Twenty years after its inception, "Silent Witness" continues to achieve good audience ratings; in 2011 Series 14 attracted an average audience of nine million viewers.
Document 6: Whitechapel (TV series): Whitechapel is a British television drama series produced by Carnival Films, in which detectives in London's Whitechapel district dealt with murders which replicated historical crimes. 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.
Document 7: Mary Jane Kelly: Mary Jane Kelly (c. 1863 – 9 November 1888), also known as Marie Jeanette Kelly, Fair Emma, Ginger, and Black Mary, is widely believed to be the final victim of the notorious unidentified serial killer Jack the Ripper, who killed and mutilated several women in the Whitechapel area of London from late August to early November 1888. She was about 25 years old, and living in poverty at the time of her death.
Document 8: Secrets of the Dead: Secrets of the Dead is an ongoing PBS television series produced by Thirteen/WNET New York, which began in 2000. The show generally follows an investigator or team of investigators exploring what modern science can tell us about some of the great mysteries of history. Most programs incorporate primary source material, first hand accounts, dramatic reenactments, and computer-generated imagery (CGI) to tell the story. The series originated in a series of the same name in the United Kingdom first shown by Channel 4 in 1999. The first two seasons for each country were broadly similar, but thereafter diverged. The US series includes some programs shown in other Channel 4 series (e.g. "Secret History"). In the case of original British episodes, PBS re-edited, re-branded and finally re-narrated them with various American voice artists. PBS description: "Scientists seek to uncover celebrated mysteries of the past in this occasional British series."
Document 9: Annie Chapman: Annie Chapman (born Eliza Ann Smith, c. 1841 – 8 September 1888), was a victim of the notorious unidentified serial killer Jack the Ripper, who killed and mutilated several women in the Whitechapel area of London from late August to early November 1888.
Document 10: Whitehall Mystery: The Whitehall Mystery is an unsolved murder that took place in London in 1888. The dismembered remains of a woman were discovered at three different sites in the centre of the city, including the future site of Scotland Yard, the police's headquarters. The incident belongs to the so-called Thames Torso Murders of 1887–89.
Document 11: Elizabeth Stride: Elizabeth "Long Liz" Stride (née Gustafsdotter) (27 November 1843 – 30 September 1888) is believed to be a victim of the notorious unidentified serial killer called Jack the Ripper, who killed and mutilated several women in the Whitechapel area of London from late August to early November 1888.
Document 12: Whitechapel (band): Whitechapel is an American deathcore band from Knoxville, Tennessee. The band is named after the Whitechapel district in East London, England, referencing the series of murders committed by Jack the Ripper. The group comprises vocalist Phil Bozeman, guitarists Ben Savage, Alex Wade, and Zach Householder, bassist Gabe Crisp, and drummer Ben Harclerode. Founded in 2006 by Bozeman and Savage, the band has released six studio albums, eleven music videos and are currently signed to Metal Blade Records. Whitechapel's 2010 album "A New Era of Corruption", sold around 10,600 copies in the United States in its first week of release and debuted at position No. 43 on the "Billboard" 200 chart. The band's self-titled fourth album was released on June 19, 2012 and debuted at No. 47 on the Billboard 200, selling roughly 9,200 copies in its first week. In 2014 the band released their fifth full-length album, "Our Endless War" to generally positive reviews. The album sold roughly 16,000 copies in its first week and debuted at no. 10 on the Billbord 200. They released their sixth full-length album Mark of the Blade in 2016 to greater critical acclaim, selling roughly 8,000 copies in the first week of its release.
Document 13: Jack Unterweger: Johann "Jack" Unterweger (16 August 195029 June 1994) was an Austrian serial killer who murdered prostitutes in several countries. First convicted of a 1974 murder, he was released in 1990 as an example of rehabilitation. He became a journalist and minor celebrity, but within months started killing again. He committed suicide following a conviction for several murders. Austrian psychiatrist Dr. Reinhard Haller diagnosed him with narcissistic personality disorder in 1994.
Document 14: Jacko hoax: The Jacko hoax was a Canadian newspaper story about a gorilla supposedly caught near Yale, British Columbia in 1884. The story, titled "What is it?, A strange creature captured above Yale. A British Columbia Gorilla", appeared in the British Columbia newspaper the "Daily Colonist" on July 4, 1884. The original newspaper article describes "Jacko" as a gorilla and not a Sasquatch. However, the "Jacko" story has been used by Bigfoot advocates as evidence for the existence of Sasquatch. Many books about Bigfoot and cryptids have featured the event and cite the original newspaper article. In 2008 Michael Cremo discussed the story as possible proof for the existence of Sasquatch. The "Jacko" story was featured on the A&E television documentary series "Ancient Mysteries" about Bigfoot, season 4, episode 18 narrated by Leonard Nimoy. The story was also mentioned on the Bigfoot episode of the television series "In Search Of...", season 1, episode 5, also narrated by Nimoy. The Jacko story was mentioned in a 1976 documentary called The Mysterious Monsters.
Document 15: Sherlock (TV series): Sherlock is a crime drama television series based on Sir Arthur Conan Doyle's Sherlock Holmes detective stories. Created by Steven Moffat and Mark Gatiss, it stars Benedict Cumberbatch as Sherlock Holmes and Martin Freeman as Doctor John Watson. Thirteen episodes have been produced, with three-part series airing from 2010–2017, and a special episode that aired on 1 January 2016. The series is set in the present day, while the one-off special features a Victorian period fantasy resembling the original Holmes stories. "Sherlock" is a co-production of the British network BBC and the American station WGBH Boston for its "Masterpiece" anthology series on PBS, along with Hartswood Films, with Moffat, Gatiss, Sue Vertue and Rebecca Eaton serving as executive producers. The series is primarily filmed in Cardiff, Wales, with North Gower Street in London used for exterior shots of Holmes and Watson's 221B Baker Street residence.
ground_truth: Jack the Ripper