The Illinois State Police investigated Dugan's admissions about the Nicarico murder and accumulated a mass of corroborating detail. Dugan was not at work the day the girl disappeared, and a church secretary, working a few blocks from the Nicarico home, recalled a conversation with him. A tire print found where Jeanine's body was deposited matched the tires that had been on Dugan's car. He knew many details about the crime that had never been publicly revealed, including information about the interior of the Nicarico home and the blindfold applied to Jeanine.