Nightmare in Wichita: The Hunt for the BTK Strangler by lawyer Robert Beattie is a non-fiction book about a serial killer in Wichita, Kansas known as the BTK Strangler.
 The book debuted at No. 4 on "The New York Times" bestseller list upon its April 2005 release.
Dennis Lynn Rader (born March 9, 1945) is an American serial killer who murdered ten people in Sedgwick County, Kansas between 1974 and 1991.
Luis Alfredo Garavito Cubillos, also known as "La Bestia" ("The Beast") or "Tribilín" (named after Disney character "Goofy"'s Latin American Spanish name) is a Colombian rapist and serial killer.
 In 1999, he admitted to the rape, torture and murder of 147 young boys.
 His victims, based on the locations of skeletons listed on maps that Garavito drew in prison, could eventually exceed 300; Garavito continues to confess to more murders.
 He has been described by local media as "the world's worst serial killer".
 According to the Attorney General's Office and various judicial bodies, Luis Alfredo Garavito is the "second serial killer of the world."
 Likewise, the judicial body ruled that all Garavito's sentences total 1853 years and nine days in jail.
Michael Eldon Burgess (born June 1, 1960) is an American actor known for his sinister television portrayal of Dennis Rader, the BTK Killer.
My Brother the Serial Killer is a 2012 American television documentary about serial killer Glen Rogers, otherwise known as the "Casanova Killer", who was convicted for a series of murders and arsons.
 The documentary was narrated by Rogers' brother Clay Rogers and aired on Investigation Discovery in November 2012.
 "My Brother the Serial Killer" received widespread media attention for Clay's claims that his brother was responsible for the 1994 murders of Nicole Brown Simpson and Ronald Lyle Goldman.
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.
Cross (also known as Smile For Me) is a 2012 Hong Kong horror thriller film written and directed by Daniel Chan, Steve Woo, Lau Kin-ping, Hui Shu-ing and starring Simon Yam, Kenny Wong, Liu Kai-chi and Nick Cheung.
 The film revolves around a Catholic serial killer played by Yam, who after witnessing his wife's death, believes he is given the duty to kill suicidal people to bring them peace and thereby allow them to enter heaven.
The Sun Hill Serial Killer was a major storyline from ITV's cop show "The Bill".
 Known originally as the "River Murders", the storyline spanned several months in 2002 and served as the exit for popular cast regular Cass Rickman (played by Suzanne Maddock).
 It was the first of several serial killer storylines from the show.
 Events came to a head in the New Year of 2003, when Acting DI Samantha Nixon discovers the truth and is taken hostage by the serial killer, before a final confrontation in which she is overpowered by DC Duncan Lennox, charged and thrown into the cells at Sun Hill Station.
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.
Harvey Miguel Robinson (born December 6, 1974) is an American serial killer who is a prisoner on death row in Pennsylvania.
 He is one of the youngest serial killers in American history.
 He was 18 years old when he was apprehended for his crimes.
 He is also the first serial killer in the history of Allentown, Pennsylvania.

Question: In which state did the serial killer played by Dennis Rader, the BTK Killer, carry out his crimes?
Answer: Kansas