As of August 2017 Six victims remain unidentified, five of whom had been buried beneath Gacy's crawl space, with one additional youth buried approximately from the barbecue pit in his backyard. Experts used the skulls of the unidentified victims to create facial reconstructions. Based upon Gacy's confession, information relative to where the victims were buried in his crawl space relative to Gacy's identified victims, and forensic analysis, police were able to determine the most likely dates when his unidentified victims were killed.