Images: John Wayne Gacy

Serial killer John Wayne Gacy.

Legal box containing items related to the John Wayne Gacy trial.

John Wayne Gacy after he was arrested by Des Plaines police.

The team of Des Plaines Police investigators who broke the case of notorious serial killer John Wayne Gacy, Jr., all of whom are no longer with the department and some are deceased. In the front row from left are, the late detective James Pickle, detective James Ryan, officer Michael Albrecht; back row from left, officer David Hachmeister, the late detective James Kautz, officer Ronald Robinson, Sgt. Joseph Kozenczak, Sgt. Walter Lang, the late detective Ronald Adams, detective Rafael Tovar, and officer Robert Schultz.

Des Plaines Police detective Rafael Tovar, center, watches as police officers remove a body from the Norwood Park Township home serial killer John Wayne Gacy.

Police officers with one of the bodies found in the crawl space of serial killer John Wayne Gacy at the home in unincorporated Norwood Park Township in 1978.

Danny Broderick holds a suit which notorious killer John Wayne Gacy wore to court. One pocket of the suit still holds butter scotch candies. Broderick co-authored a book with Sam Amirante, John Wayne Gacy's defense attorney, entitled, "Defending the Monster."

Police at the home of serial killer John Wayne Gacy in unincorporated Norwood Park Township.

Serial killer John Wayne Gacy.

The home of serial killer John Wayne Gacy in unincorporated Norwood Park Township.

Police officers and firefighters with one of the bodies found in the crawl space of serial killer John Wayne Gacy.

Des Plaines detectives take John Wayne Gacy to jail.

Sam Amirante, John Wayne Gacy's defense attorney, discusses his book, "Defending the Monster."

Serial killer John Wayne Gacy.

Serial killer John Wayne Gacy.