A Bolivian ranch owner has been jailed for 30 years over the 2010 killing of a French couple. br br Jaime Martinez was found guilty of murdering Jeremy Bellanger, 25, and 23-year-old Fanny Blancho, who went missing in the small Amazonian town of Beni Guayaramerin, 710 kilometres north-east of La Paz, near the border with Brazil.