John Wayne Gacy's blood is being used in an attempt to solve a host of unsolved murder cases around the country.

The Cook County Sheriff's Department in Illinois created a DNA profile of Gacy along with other killers in an attempt to try and see if other unsolved cases could be linked to the executed criminals.

The genetic profiles were put into the law enforcement database shared nationally by investigators, according to the Daily Mail. The profiles were compiled using the last remains of the dead criminals such as blood, hair and skin fragments.

It's very likely that other murders were committed by Gac that were not reported. The effort by the Cook County Sheriff's Department is done with the hope that other law enforcement agencies around the country will profile their own convicted killers in the same fashion.

Detective Jason Moran, the lead investigator for Cook County, said that the infamous serial killer likely had victims in many areas that are still unknown.

"He traveled a lot," Moran said of Gacy, as reported by CBS. "Even though we don't have any information he committed crimes elsewhere, the sheriff asked if you could put it past such an evil person."

The effort began after three vials of the killer's blood was found and testing was done on the remains of some of Gacy's victims. DNA profiles were created and compared to the executed serial killer which helped identify one of the victims.

John Wayne Gacy was convicted for slaying at least 33 teenage boys in sexually-motivated crimes during the 1970s. The bodies of many of his victims were found in a crawl space at the killer's residence. He was known as the "killer clown" for dressing up in the fashion at charitable events and children's parties. He was executed in May 1994.