When shown a driver's license issued to a Robert Hasten which had been discovered on his property, Gacy claimed not to know him however admitted that this license had been within the possession of one in all his victims. Accompanied by police, his lawyers, and his older sister, Gacy was pushed to the I-55 bridge on December 23 to pinpoint the precise spot where he confessed to having thrown the physique of Robert Piest and four other victims into the river. He acknowledged he had murdered "at the very least thirty" victims, most of whom he had buried in his crawl space, and had disposed of five different our bodies within the Des Plaines River. When asked whether he had been to the crawl space, Cram replied he had once been asked by Gacy to unfold lime down there and had also dug trenches, which Gacy had defined had been for drainage pipes. Evidence technician Daniel Genty then entered the 28-by-38-foot (8.5 m × 11.6 m) crawl area, crawled to the southwest area and started digging. The 2 then started digging within the southeast nook, uncovering two lower leg bones. Gacy then had Cram drive him to Maryhill Cemetery, the place his father was buried.
