The settled part
John Wayne Gacy was arrested in December 1978. Remains were recovered from the crawl space of his house in Norwood Park Township and from the ground around it, and from the Des Plaines River. He was convicted in 1980 of thirty-three murders committed through the 1970s, and executed in 1994.
None of that is disputed, and this entry does not dispute it. The men and boys he killed were real people, several of them were teenagers, and the identification of all of them took more than forty years.
The question that did not close
The open question is narrow and it is evidentiary rather than speculative: whether, for some of the thirty-three, Gacy could physically have been the one who did it.
Two criminal defence attorneys in Chicago went through the records and concluded he had help with at least three. Their argument rests on his movements, which are documented because he ran a construction business and travelled for it.
Russell Nelson and Robert Gilroy both disappeared in 1977. Gacy is recorded as having been out of Chicago when each of them went missing. In the case of a third victim, John Mowery, the attorneys argue the available window does not leave enough time to abduct and kill him.
There is also a witness account. A survivor of an assault told police that someone else had been in the house while it happened.
And there is the practical objection that has been made since 1978. Gacy employed young men, two of whom lived in the house at various points, and the work of abducting, restraining and burying thirty-three people in and around a suburban property over six years is a great deal of work to do unobserved by people sharing the building.
What is against it
The counter-arguments are not weak and should be stated.
Travel records establish where a man was supposed to be, not where he was, and a construction contractor's schedule is not an alibi of the kind a court would accept as conclusive in either direction. Disappearance dates are approximate; the date a person was last seen is not necessarily the date they died, and for victims who went unidentified for decades even that is uncertain.
Gacy himself gave many accounts, several of them self-serving, and at times claimed others were involved — which is exactly what a man facing execution might say whether or not it was true. He never named anyone in a way that led anywhere, and he was not a reliable narrator of his own case.
No physical evidence has ever implicated another person. No accomplice has been identified, charged or prosecuted.
Why it belongs here rather than in a true-crime shelf
Because the question is being kept open by the wrong people for a conspiracy theory.
This is not a claim advanced by anonymous forums. It has been pressed by defence attorneys working from the case file, and the evidence they point at — travel records, timing, a survivor's statement — is the ordinary material of a criminal investigation rather than inference from a photograph.
It also sits beside something the authorities have actively done. In 2011 the Cook County Sheriff's Office exhumed the remains of eight victims who had never been identified and applied DNA methods that did not exist in 1979. It has worked: names have been returned, including Francis Wayne Alexander in 2021, identified from DNA recovered from a tooth more than forty years after he died.
That effort is the reason the accomplice question cannot simply be dismissed as closed. An investigation that is still producing new facts about who the victims were is not an investigation that established everything about how they died.
Where it stands
Thirty-three murders, one man convicted, no evidence produced that anyone else took part.
What remains is a set of timing problems that the people who have examined the file most closely regard as real, and which have never been resolved either way. That is not the same as a conspiracy, and it is not nothing. The honest statement is that the case was closed on the man who was certainly responsible for most of it, and that the question of whether he was responsible for all of it was never answered.