Peter Sutcliffe, aka the Yorkshire Ripper, is known to have killed two women in Manchester - Vera Millward, a mother-of-seven, and Jean Jordan, mother-of-two, as well as eleven other women. But were there other killings he got away with?
It's a theory explored by former police intelligence officer and writer, Chris Clark, who believes Jacqueline Ansell-Lamb and Barbara Mayo - two hitchhikers murdered in 1970 - were 'secret' victims of the serial killer, who died 18 months ago. Here, Manchester Evening News chief reporter Neal Keeling examines two tragic unsolved cases - and the theories that surround them.
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