like lynda mann, dawn ashworth had been strangled and sexually assaulted. >> dawn had marked injurieshich would indicate was a very violent attack. and injuries elsewhere on the body would indicate she suffered violent injury therefore she had been attacked violently which would indicate that he had put up a fair struggle before she died. >> semen samples taken revealed that the attacker had the same blood type as the man who attacked lynda mann. >> both girls were teenagers. both girls were walking alone. >> both women were strangled, both severely sexually assaulted. >> all school girls were advised to travel in groups and not to walk anywhere alone. dawn ashworth's father had given his daughter the same advice. >> i warned her and warned her about the dangers of going down there on the road. >> we've got to find the one who did this to my daughter, to our daughter. and stop it from happening again. >> police launched an extensive investigation into the murder of dawn ashworth and within a week police got a break. witnesses saw a young man in the vicinity of ten pound lane on if aft