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.

One page typed letter to 13 yr old female pen pal. Letter has good content and is dated August 5, 1989. Letter is signed John in pen and is in very good condition. Original matching envelope is included, however envelope was opened on the left side unevenly resulting in part of Gacy's return address torn away, otherwise it is in good condition.