During the cold months of July and August, many southern Australians head north to warmer climes. A favourite destination is north Queensland, with its jungles, rainforests, mangrove swamps and rivers. And saltwater crocodiles. David Hogbin, a 40-year-old father-of-three and GP from New South Wales, was one such sun-seeking tourists. He travelled north with his family on holiday, but will never return home.