Analysis of information sources in references of the Wikipedia article "Michael Sams" in English language version.
A 1995 book said Michael Sams, who murdered prostitute Julie Dart and kidnapped property consultant Stephanie Slater, also killed Ms Lamplugh, but police were not convinced by the theory.
Sams was 51 when he was given a life sentence in 1993 for murdering Ms Dart, who was 18, and kidnapping Stephanie Slater, who was 25. He was ordered to spend a minimum term of 25 years in prison.