Question:  David Victor Canter is a psychologist that helped police on a case involving two serial killers who attacked numerous women and children in the south of what?
Sentence (from "John Duffy and David Mulcahy"): John Duffy and David Mulcahy (both born 1959) are two British rapists and serial killers who together attacked numerous women and children at railway stations in the south of England during the 1980s.
Relevant evidence: Yes