When Philadelphia police made a grisly discovery in the closet of Ira Einhorn's apartment in 1977, they promptly arrested the self-proclaimed environmental activist and Earth Day master of ceremonies for murder. However, before the authorities were able to prosecute the accused murderer for viciously ending the life of a young woman, Einhorn fled to Europe and evaded law enforcement for more than two decades.

Einhorn - who referred to himself as the "Unicorn" because his last name means "one horn" in German - was dubbed the "Unicorn Killer" by the media, and investigators worked tirelessly to find the mystical guru turned murderer. When Einhorn was finally captured while living in France, the people in his hometown of Philadelphia were overjoyed to learn the hated Unicorn Killer was finally going to be held accountable for beating his former girlfriend - Holly Maddux - to death more than 20 years earlier.