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On 4 July 1972 Robin Jeanne Hoinville-Bartram left Melbourne in company with Anita Cunningham for a hitch-hiking holiday to visit her mother in Bowen, QLD. On 15 November 1972, Hoinville-Bartram's remains were located in Sensible Creek under a bridge on the Flinders Highway, approximately 80 kilometres west of Charters Towers. She had been sexually assaulted and shot in the head with a .22 calibre rifle. No trace of Anita Cunningham has been found. Hoinville-Bartram and Cunningham were two of seven female hitch-hikers who were killed in Queensland between 1972 and 1976. Information indicated the pair, who began their journey from NSW's Hume Highway, had gone to Darwin before travelling to Mount Isa. "
Police have not ruled out that the women may have been the victims of a serial killer such as Ivan Milat or Arthur Stanley Brown who was charged in 1998 with the murder of two Townsville schoolgirls in 1970.