The Hunt for the BTK Killer is a 2005 biographical telefilm directed by Stephen T. Kay.
 First shown on CBS it is based on the true story of Dennis Rader killing ten people from 1974 to 1991.
 Though the events take place in Wichita, Kansas, the film was made in Nova Scotia.
Curse of the Zodiac is a 2007 American horror film from Lionsgate, written and directed by Ulli Lommel, inspired by the true story of the hunt for a notorious serial killer known as "Zodiac" who claimed responsibility for the still unsolved murders.
Memories of Murder () is a 2003 South Korean crime-drama film co-written and directed by Bong Joon-ho.
 It is based on the true story of Korea's first serial murders in history, which took place between 1986 and 1991 in Hwaseong, Gyeonggi Province.
 Song Kang-ho and Kim Sang-kyung star as Detective Park and Detective Seo, respectively, two of the detectives trying to solve the crimes.
The Chilobwe murders were a series of murders, numbering at least thirty killings, which took place over several months starting in November 1968 in the suburbs of Blantyre, Malawi, particularly in Chilobwe.
 A number of rumours grew up around these murders, and many blamed them on the South African Government which, according to various popular accounts, wanted repayment of loans it had given to the Malawi Government, either in human blood or by the enslavement of Malawians to work in South Africa.
 These rumours were politically damaging to the government of Hastings Banda, which cultivated friendly relations with South Africa's white minority government, and he treated the murders as a serious issue requiring urgent resolution.
 The murders were never fully solved.
 Several men were arrested in connection with the murders in 1969, but acquitted for lack of evidence.
 This caused popular outrage at the criminal justice system which, at that time, was still based on English law and practice.
 In 1970 another man, Walla Kawisa, made several confessions admitting to some of the murders.
 He was condemned to death and probably executed in May 1972.
 It is unlikely that the murders were the work of a single individual, and various theories have been proposed, some linking them to opposition to Banda.
 Banda himself blamed the murders on ex-ministers involved in the Cabinet Crisis of 1964, and removed Gomile Kumtumanji, a Member of Parliament cabinet minister for the Southern Region from office and had him tried for treason, allegedly for complicity in them.
The Flat-Tire murders refer to five connected, unsolved murders in Dade County, Florida in 1975.
 Investigators theorized that the killer deflated the tires of the victims' vehicles and offered them assistance before killing them.
 All the murders took place in the vicinity of Cutler Bay (known at the time of the killings, and until 2005, as Cutler Ridge) and the Palmetto area of South Miami-Dade County.
Dennis Lynn Rader (born March 9, 1945) is an American serial killer who murdered ten people in Sedgwick County, Kansas between 1974 and 1991.
Murder on the High Seas – "The True Story of the Joe Cool's Tragic Final Voyage" is a true crime book written by Carol Soret Cope, bestselling author of "In the Fast Lane: A True Story of Murder in Miami" and "Stranger Danger: How to Keep Your Child Safe".
 The book explores the investigation into the mysterious murders aboard the Joe Cool.
Bitten by the Tiger: The True Story of Impeachment, the Governor & Tammany Hall is a book written by the New York State politics and government expert Jack O'Donnell and was published by Chapel Hill Press in 2013.
 The book details one of the biggest news stories of 1913; the rise, achievement and fall of the first and only Governor in New York to be impeached, William Sulzer.
 Carefully researched by O'Donnell, the book examines what he explains as "the unique events that allowed history to remember Sulzer as the “wronged reformer” and kept the true story hidden for 100 years."
 With the use of transcripts from Sulzer's impeachment trial, as well as other first hand and original accounts, O'Donnell offers the reader the true story behind William Sulzer, as well as others who took part in these events.
 Well known individuals such as Al Smith, William Randolph Hearst, Robert Wagner and Tammany Hall boss Charlie Murphy.
Randall Brent "Randy" Woodfield (born December 26, 1950) is an American serial killer who was dubbed The I-5 Killer or The I-5 Bandit by the media due to the crimes he committed along the Interstate 5 corridor running through Washington, Oregon, and California.
 Before his capture, the I-5 Killer was suspected of multiple sexual assaults and murders.
 A native of Oregon, Woodfield was convicted of three murders and is suspected of killing up to 44 people.
 He is currently incarcerated at the Oregon State Penitentiary.
 In 2011, Woodfield was the subject of a Lifetime television movie "Hunt for the I-5 Killer".
 The movie was based on the book "The I-5 Killer" by crime author Ann Rule.
The Royal Calpe Hunt of the British Crown Colony of Gibraltar originated in 1812 as the Civil Hunt.
 The fox hunt was initially a civilian endeavour that began when a pair of English foxhounds were imported to Gibraltar.
 The hunts took place across the border, in the Campo de Gibraltar area of Spain.
 However, in 1814, the membership of the Hunt underwent a substantial change.
 Many officers of the Gibraltar garrison joined the Hunt, which shifted from a civilian to a military enterprise.
 That year, the name was changed to the Civil Calpe Hunt.
 It retained that title until 1817, after which it was known as the Calpe Hunt.
 The first Master of the Hunt was Charles Elphinstone Fleeming.
 However, the Master most associated with the Hunt was Pablo Larios, Marquis of Marzales, who held that title for forty-five years.
 His election to that position in 1891 was not only historic, but strategic.
 His appointment represented only the second time that the position had not been filled by a member of the military.
 In addition, his Spanish heritage and influence in the Campo de Gibraltar, where he owned extensive estates, garnered him the loyalty of the local Spanish farmers, and therefore eased the ever-present tensions between the military and the farmers over the crop damage that was inherent to the Hunt.
 In 1906, King Edward VII of the United Kingdom and King Alfonso XIII of Spain became joint Patrons of the Hunt, after which it was known as the Royal Calpe Hunt.
 The tradition of the Hunt continued for more than a century, until 1939, and the onset of the Second World War

Question: "The Hunt for the BTK Killer" is based on the true story of murders that took place in what county?
Answer: Sedgwick County