Peter Tobin - who denies murdering 18-year-old Dinah McNicol who vanished in August 1991 - had already been convicted of killing 15-year-old Vicky Hamilton, a jury at Chelmsford Crown Court was told.
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Murder accused of killing sixth former serving life for murder
A man accused of murdering a sixth former who disappeared 18 years ago is a convicted child killer already serving a life sentence, a court has heard.
