 Officers of the Metropolitan Police undertook the investigation, under pressure to find the perpetrator from public outrage at the circumstances of the murder and press coverage.Thirty-two men were questioned in connection with the murder, the investigation quickly targeted Colin Stagg, an unemployed man from Roehampton who was known to walk his dog on the Common.As there was no forensic evidence linking Stagg to the scene, the police asked a criminal psychologist to create an offender profile of the killer.