Ira Einhorn, famously known as the "Unicorn Killer," was an American counterculture guru, environmental activist, and convicted murderer. In 1977, Einhorn’s ex-girlfriend vanished after going to the Philadelphia apartment they had shared to collect her belongings. Eighteen months later, in March 1979, police searched Einhorn’s apartment and discovered her mummified remains hidden inside a locked steamer trunk in his closet.