O'Neil said he is looking for blood samples for the rest of the 12 condemned inmates executed between 1977 and 2000. So far, DNA profiles have been completed on the blood of Gacy and two others.
Among the other executed inmates whose blood was submitted for testing was Lloyd Wayne Hampton, a drifter executed in 1998. Hampton’s long list of crimes included some outside the state — one conviction was for the torture of a woman in California. But shortly before he was put to death, he claimed to have committed additional murders but never provided details.
So far, no computer searches have linked Gacy or the others to other crimes. But Moran and O'Neil suspect there are investigators who are holding aging DNA evidence that could help solve them.
That is what happened during the investigation into the 1993 slayings of seven people at a suburban Chicago restaurant, during which an evidence technician collected and stored a half-eaten chicken dinner as part of the evidence. There was no way to test it for DNA at the time, but when the technology did become available, the dinner was tested and revealed the identity of one of two men ultimately convicted in the slayings.
Moran wants investigators in other states to know that Gacy’s blood is now available for analysis in their unsolved murders. He hopes those jurisdictions will, in turn, submit DNA profiles of their own executed inmates.
‘‘That is part of the DNA system that’s not being tapped into,’’ he said.