Cold cases: The detectives on the trail of undiscovered killers
A team of detectives based in south London is using forensic science advances in an effort to solve cold case murders.
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''A dedicated team of British detectives is working to solve cold case murders. And with advances in forensic science, they are hoping to bring some of the killers to justice.
At midday, on 24 November 1975, Margaret Lightfoot left her home in Loughton to take her Airedale puppy for a walk in nearby Epping Forest.
Mrs Lightfoot was seen by a neighbour.
Later, another neighbour saw the dog running loose in the street and took it back to Mrs Lightfoot's house, leaving it in the garden.
When Mrs Lightfoot did not return home, her husband reported her missing in the early evening and a search was started.
It was called off after dark and resumed the next morning, when Margaret's naked body was found in heavy undergrowth. She'd been strangled.''
''However, a detailed type-written report of the case from the officer in charge at the time has been recovered from police archives, together with items of evidence known as "exhibits".
And they've given police renewed hope of a breakthrough.
Wellington boots
"We have been lucky, because we still have some property from the crime scene," says acting Detective Inspector Susan Stansfield, an officer from the Metropolitan Police's cold case unit."We've asked our forensic scientists to re-examine those items to see if we can use any modern-day techniques - back then we would only have been able to fingerprint items," says DI Stansfield.''
''Scientists are focusing on the two Wellington boots Mrs Lightfoot had been wearing, found underneath her body.
Detectives believe the boots had been pulled off by her killer and may therefore contain traces of his DNA.''