With childhoods steeped in the teachings of the Mormon religion, both Israel Keyes and Arthur Gary Bishop would become some of the sickest serial killers in American history. Keyes criss-crossed the country during his reign of terror, killing both men and women. His true death count is unknown as he committed suicide before revealing any further information. Bishop was the archetypal child molester, luring young boys with promises of candy and toys. Like Keyes, his true victim count is unknown.