Roger Parrish and Pauline Murrell believe chances were missed to get to Fourniret before he beat, raped and killed their daughter and threw her body in a river in 1990.
Murrell said: "If the gendarmes had done their jobs correctly in the first place, a lot of girls would have been saved. The investigation was completely botched." This week Fourniret's ex-wife, Monique Olivier, 75, was found guilty of complicity in the murder of Joanna and two French victims.
Parrish said: "If the authorities had been more efficient and acted together, it's quite likely that.
Fourniret and Olivier would have been caught long before and lives would have been saved." Joanna, 20, from Newnham-on-Severn in Gloucestershire, was working as a teaching assistant at a school in Auxerre in France when she was targeted by Fourniret and Olivier.
Parrish said: "There were suggestions Fourniret had been seen around the lycée where she worked and suggestions he made phone calls to the lycée, and those calls were reported to the police.
"Going back before that, one of the victims had grandparents living in the same small community where he lived. He already had a record by then. For goodness sake, why wasn't he questioned, or at least his movements tracked?
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