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The torso of Ms Halstead was found in a canal in Rotterdam, Holland, in 1990, the court heard.
BBC: John Sweeney found guilty of canal murders
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Miss Halstead's torso was found in a Rotterdam canal in 1990, while 31-year-old Ms Fields' remains were found in London's Regent's Canal in 2001.
BBC: Search for canal killer John Sweeney's 'missing women'
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Mr Sweeney, 54, of no fixed address, denies murdering Ms Halstead, 33, whose torso was fished out of a canal in Rotterdam, Holland, in 1990.
BBC: John Sweeney 'canal victim predicted her own death'