Execution Date and Method
John Wayne Gacy was executed by lethal injection on May 10, 1994, at Stateville Correctional Center in Crest Hill, Illinois. He was the 17th inmate put to death in Illinois since the state reinstated the death penalty in 1977. The execution followed a long appeals process that exhausted all state and federal remedies. Gacy spent 14 years on death row before his sentence was carried out.
The lethal injection protocol used in Illinois at the time involved a sequential administration of three drugs. The first drug, sodium thiopental, was intended to induce unconsciousness. The second, pancuronium bromide, stopped respiration, and the third, potassium chloride, stopped the heart. Gacy was pronounced dead at 12:58 a.m. He declined a last meal and made no final statement.
Conviction and Sentencing
Gacy was convicted on March 13, 1980, of 33 counts of murder. The Cook County jury deliberated for less than two hours before returning a death sentence for 12 of the counts. The remaining counts resulted in consecutive life sentences. Prosecutors presented evidence of sexual assault and the disposal of victims' remains beneath his home at 8213 West Summerdale Avenue.
The trial drew intense media coverage and became a landmark case in Illinois criminal history. Gacy, who had performed at community events as "Pogo the Clown," shocked the public with the scale of his crimes. His defense team argued mental illness, but the jury rejected the insanity plea. The conviction was upheld on direct appeal to the Illinois Supreme Court.
Victim Identification and Recovery
Investigators recovered the remains of 26 of Gacy's victims from the crawl space beneath his house. The remaining victims were found in the Des Plaines River. Identification efforts continue to use forensic genealogy and DNA analysis. The Cook County Sheriff's Office has worked with the National Missing and Unidentified Persons System to resolve lingering cases.
As of the latest updates, most victims have been identified, though a few remain unidentified. The case has been documented in multiple true crime books and documentaries. Families of the victims have pursued civil remedies and advocated for stronger sex offender registries. The case remains a reference point in discussions about serial offender profiling and criminal justice procedures. For more details on the investigation, see the FBI case summary here. The Illinois Department of Corrections maintains records on the execution here.