Question: What US state became headline news when Police Chief Joseph Kozenczak investigated John Wayne Gacy's serial killing spree.  

Context paragraphs:
Svetozar Ristovski: Svetozar Ristovski (born January 26, 1972) is a Macedonian film director who now resides in Canada.  His first film was the 2000 short "Hunter" about the psychological study of a wartime sniper.  He marked his English language debut with 2010 "Dear Mr. Gacy" based on American serial killer John Wayne Gacy.  In addition to the awards he won for "Mirage", he also won the Golden Lily Award at GoEast for "Joy of Life" in 2002.

CNN Philippines Headline News: CNN Philippines Headline News was the English-language morning newscast of CNN Philippines, replacing "Daybreak".  "CNN Philippines Headline News" aired from March 16, 2015 to February 12, 2016, was broadcast at 7 am, Monday through Friday, and was anchored by Amelyn Veloso, Claire Celdran, and Claudine Trillo.  "CNN Philippines Headline News" was replaced by the Philippine version of the CNN/US's morning program "New Day".

Master of Brutality: Master of Brutality is the debut album by the Japanese stoner rock/doom metal band Church of Misery.  Five of the six tracks are based on and titled after infamous serial killers, Edmund Kemper, Peter Sutcliffe, Herbert Mullin, and John Wayne Gacy (portrayed on the cover).  The instrumental track "Green River" is inspired by serial killer Gary Ridgway.  The first track "Killifornia" contains audio of spoken words by Ed Kemper.  The artwork and booklet contains pictures and sketches of John Wayne Gacy; the back art has John Gacy dressed as "Pogo the Clown".

Roger Davis (cricketer): Roger Clive Davis (born 15 January 1946) is a former county cricketer who played for Glamorgan for 13 years as an all-rounder.  While having a quiet career from his debut in 1964 until 1970, he then enjoyed five years of greater success, including scoring over 1,000 runs in the 1975 season, before a rapid decline in 1976 which saw him dropped from the team.  He nevertheless enjoyed a successful career, with over 7,000 runs and 241 wickets in first class cricket.  He became headline news in 1971, when a ball hit him on the side of the head while he was fielding in the dangerous "short leg" position, causing his heart and breathing to stop.

Madonna Wayne Gacy: Stephen Gregory Bier Jr. (born March 6, 1964, Fort Lauderdale, Florida), formerly known by his stage name Madonna Wayne Gacy and by the nickname Pogo (John Wayne Gacy's clown name), is the former keyboard player for Marilyn Manson, from 1989 to 2007.  His stage name came from the names of the singer Madonna and the serial killer John Wayne Gacy.

Nangpa La shooting incident: The Nangpa La shooting incident happened on September 30, 2006 when a group of unarmed Tibetan refugees attempted to flee Tibet via the Nangpa La pass.  They were fired upon by Chinese border guards.  Kelsang Namtso, a 17-year-old nun, was killed and a number were injured.  Of the Tibetan group, 41 reached India, but 32 were taken into custody by Chinese border guards — most were later released, but some are still unaccounted for.  Some of those released claimed they suffered torture and hard labor.  Nangpa La is a traditional trade route between Tibet and Nepal.  The victims were shot from a distance by border guards as they moved slowly through chest-deep snow.  The Chinese government initially denied the charges, but Kelsang's death was filmed by Romanian photographer Sergiu Matei, who was nearby as part of a climbing expedition.  After Matei smuggled the video out of Tibet, it became headline news around the world, drawing attention to the plight of Tibetans under Chinese rule/occupation.

Joseph R. Kozenczak: Joseph R. Kozenczak was the former Chief of Police of Des Plaines, Illinois where he worked for 27 years.  He is recognized for his role of Chief Investigator of the John Wayne Gacy Serial Murder Investigation in 1978.

When the Kite String Pops: When the Kite String Pops is the debut album of American sludge metal band Acid Bath.  Released on August 8, 1994, it is considered an underground classic.  The album's artwork is a painting made by notorious serial killer John Wayne Gacy while in prison awaiting execution, you can see that the balloons on the lower part contain both his nickname, "Pogo the clown", and his name, J. W. Gacy.  On the Double Live Bootleg!  DVD (2002), Dax Riggs introduced the song "Tranquilized" by saying, "This song is about getting high any way you do it, and kicking the earth from beneath you" and "Cheap Vodka" by saying, "This song is about getting wasted and killing things, blood, sex, and blasphemy."  "Toubabo Koomi" is Cajun French for "land of the white cannibals."  It was the only Acid Bath song that was made into a music video.  The song "God Machine" begins with a spoken word introduction by Dax Riggs.

Death in the City of Light: Death In The City Of Light: The Serial Killer Of Nazi-Occupied Paris is a nonfiction true crime book by David King first published in 2011.  The book covers the serial killing spree in Paris that took place while that city was occupied by the Nazis during World War II, the trial of the chief suspect - Dr. Marcel Petiot, and the circus that ensued.

John Wayne Gacy: John Wayne Gacy Jr. (March 17, 1942 – May 10, 1994) was an American serial killer and rapist.  He sexually assaulted, tortured and murdered at least 33 teenaged boys and young men between 1972 and 1978 in Cook County, Illinois (a part of metropolitan Chicago).

Supporting paragraphs: Joseph R. Kozenczak John Wayne Gacy
Answer: Illinois