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How the investigation into Phillip Inhofer at his home in Sacremento led police to a 20-year-old call girl known as Bat Girl.
How detective David Baker became the first person to use DNA profiling in a criminal investigation, when looking for the killer of two young girls in 1986.
How police used CCTV, eyewitness statements and a public appeal to find the killer of a 28-year-old woman, found dead on Nottingham's streets.