John Wayne Gacy, Jr. (March 17, 1942 – May 10, 1994) was an American serial killer and rapist who sexually assaulted and murdered at least 33 teenage boys and young men between 1972 and 1978. Gacy buried 26 of his victims in the crawl space of his home, buried three others elsewhere on his property, and discarded the remains of his last four known victims in a nearby river. He was convicted of 33 murders and sentenced to death for 12 of these killings. He was executed in May 1994.
Jeffrey Lionel Dahmer (May 21, 1960 – November 28, 1994) was an American serial killer and sex offender. Dahmer murdered 17 men and boys between 1978 and 1991, with the majority of the murders occurring between 1987 and 1991. His murders involved rape, dismemberment, necrophilia and cannibalism. On November 28, 1994, he was beaten to death by an inmate at the Columbia Correctional Institution, where he had been incarcerated.
H.H. Holmes: Known as one of America’s first serial killers, Holmes had a three-story building constructed, disguised as a pharmacy/hotel on the first floor, the upper floors contained his living quarters and many small rooms where he tortured and killed his victims. Some of these rooms had gas jets so that Holmes could asphyxiate his victims and trapdoors and chutes so that he could move the bodies down to the basement where he could burn his victims’ remains in a kiln.