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Crime & Justice • Serial Killers

John Wayne Gacy

John Wayne Gacy was an American serial killer and sex offender who was convicted of murdering 33 boys and young men in Illinois during the 1970s.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

John Wayne Gacy was an American serial killer and sex offender who was convicted of murdering 33 boys and young men in Illinois during the 1970s. He became widely known as the “Killer Clown” because he performed as a clown at public events before his crimes were discovered.

Early life and career

Gacy was born in Chicago in 1942 and later worked as a contractor in the Chicago area. He also performed as a clown at charitable and children's events, which contributed to his public image before his arrest.

Crimes

Between 1972 and 1978, Gacy raped, tortured, and murdered at least 33 boys and young men, most of them in Cook County, Illinois. Many of the bodies were later found buried under or around his property.

Investigation and arrest

Gacy came under police scrutiny in 1978 during an investigation into the disappearance of Robert Piest. Searches of his property uncovered human remains, leading to his arrest and prosecution.

Trial and execution

Gacy was convicted of 33 murders in 1980 and sentenced to death. He was executed by lethal injection on May 10, 1994, at Stateville Correctional Center in Illinois.

Key facts

  • Gacy murdered at least 33 boys and young men in the Chicago area between 1972 and 1978.
  • He was arrested in 1978 after a missing-person investigation linked him to the crimes.
  • Investigators found many of the victims buried beneath or near his home in Norwood Park Township, a suburb of Chicago.
  • He was convicted in 1980 and received a death sentence.
  • He was executed by lethal injection on May 10, 1994, at Stateville Correctional Center.
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Canadian context

Gacy’s case is widely known in Canada through true-crime coverage, documentaries, and popular culture, and it is often cited in discussions of serial murder investigations and criminal profiling.

Frequently asked questions

Who was John Wayne Gacy?
John Wayne Gacy was an American serial killer and sex offender convicted of murdering 33 boys and young men in Illinois in the 1970s.
How many people did John Wayne Gacy kill?
He was convicted of 33 murders and was accused of additional killings, but 33 is the official conviction count.
What did John Wayne Gacy do?
He kidnapped, sexually assaulted, tortured, and murdered boys and young men, many of whom were buried on or near his property.
How was John Wayne Gacy caught?
He was caught after police investigating a missing teenager linked him to the case and searched his property, where remains were found.
What was John Wayne Gacy's occupation?
He worked as a contractor and also performed publicly as a clown, including at charity and children's events.
When was John Wayne Gacy executed?
He was executed by lethal injection on May 10, 1994.

References

  1. Wikipediahttps://en.wikipedia.org/wiki/John_Wayne_Gacy
    Supports: Basic biographical details, crimes, conviction count, clown alias, and execution date.
  2. Encyclopaedia Britannicahttps://www.britannica.com/biography/John-Wayne-Gacy
    Supports: Biography, conviction count, and execution date.
  3. Biography.comhttps://www.biography.com/crime/john-wayne-gacy
    Supports: Crimes, arrest, conviction, and burial of victims under his house.
  4. Crime Museumhttps://www.crimemuseum.org/crime-library/serial-killers/john-wayne-gacy/
    Supports: Execution date.
  5. NBChttps://www.nbc.com/nbc-insider/the-true-story-of-john-wayne-gacy-explained
    Supports: Occupation, conviction count, and execution date.
  6. EBSCO Research Startershttps://www.ebsco.com/research-starters/history/john-wayne-gacy
    Supports: Career, crimes, arrest, confession, conviction, and execution.
  7. Netflix Tudumhttps://www.netflix.com/tudum/articles/who-was-john-wayne-gacy-everything-to-know
    Supports: Conviction count, burial of victims, arrest, and execution.
  8. A&Ehttps://www.aetv.com/articles/john-wayne-gacy
    Supports: Criminal profile, conviction count, and clown persona.