The case of Ivan Millat, who killed at least seven backpackers in New South Wales, Australia, during the early 1990s. Police were initially confounded by the marked differences in the murders and it was suggested two offenders could be on the loose. However, evidence eventually began to mount against Millat, who had been charged with the rape of two women in 1971, and it was ascertained he was the only culprit

• Tim Pigott-Smith