The mother of a teenager murdered by a convicted rapist says she will sue four police forces for failing to keep track of the man who killed her.
Facebook killer Peter Chapman was allowed to slip away from Merseyside Police with "terrible consequences", the Independent Police Complaints Commission said this week.
It blamed "inadequate resources" for the "poor management" of the predator who murdered 17-year-old Ashleigh Hall in October 2009 after he pretended to be a teenager when he befriended her on Facebook.
The IPCC report revealed Merseyside's Knowsley sex offender unit -- tasked with monitoring Chapman -- was being run by a single female police constable who was in charge of monitoring more than 60 sex offenders and was making visits alone in her own car due to a lack of resources.
Andrea Hall (41) from Darlington, said she was going to sue the Merseyside, Cleveland, Durham and North Yorkshire forces for failing to keep track of the 32-year-old killer.
She said: "It's not about money, I have got to prove a point. They were in the wrong and if they had done their job properly my daughter would still be here."
When the IPCC report was published on Wednesday, Assistant Chief Constable Andy Ward, of Merseyside Police, said the force had put in place "a number of improvements" to strengthen the management of sex offenders.
He added: "However, it is clear that, in this case, the process we had in place at that time fell short of the required standard.
"We recognise the importance of managing sex offenders appropriately."
But Mrs Hall said: "They say they have learned from it, but it is too late. It has taken the murder of my daughter to make them see they were doing their job wrong. The police are supposed to make you feel safe. But Merseyside Police had one officer monitoring 60 sex offenders. How were they making people in Liverpool safe?"
She added: "This is not about money, it doesn't interest me and money won't bring my daughter back."