John Wayne Gacy, Jr. was an American serial killer and rapist, also known as the Killer Clown, who was convicted of the sexual assault and murder of a minimum of 33 teenage boys and young men in a series of killings committed between 1972 and 1978 in Chicago, Illinois.

All of Gacy's known murders were committed inside his Norwood Park home; his victims would typically be lured to this address by force or deception and all but one victim was murdered by either asphyxiation or strangulation with a tourniquet (his first victim was stabbed to death). Gacy buried 26 of his victims in the crawl space of his home; three further victims were buried elsewhere on his property, while the bodies of his last four known victims were discarded in the Des Plaines River.

Two page typed letter from Gacy on his own personal letterhead. Letter is dated July 15, 1990. Envelope is not included.

To read the letter in full please follow the below links:
serialkillersink.net/gacy/gacy2a.jpg
serialkillersink.net/gacy/gacy2b.jpg