At a morning news conference, Dart asked that anyone with missing loved ones come forward to give DNA samples in hopes of matching names to the remaining eight Gacy victims. The period in question would be anyone who disappeared between 1972 and 1979.
Gacy was convicted in the murder of 33 young men and boys, most found buried in the crawl space of his Norwood Park Township home near O'Hare Airport. The former construction contractor was executed in May of 1994.
In a wide-ranging investigation spanning the last six months, sheriff's investigators exhumed the eight unidentified bodies and were even forced to search for some jawbones which had been separated from the bodies in the original investigation 30 years ago.
Those mandible bones had been buried separately by the medical examiner's office after their investigation was completed.
Gacy buried 26 of his victims in the crawl space beneath his home. Three others were found beneath other areas of his property. His last four victims were thrown from a bridge into the Des Plaines River.