Carl Tanzler
Georg Carl Tänzler, also known as Count Carl von Cosel (February 8, 1877 – July, 1952 ), was a German-born American radiology technologist at the Marine-Hospital Service in Key West, Florida, United States. He developed an obsession with a young Cuban-American tuberculosis patient, Elena "Helen" Milagro de Hoyos (July 31, 1909 – October 25, 1931), that carried on well after her death.