The family of a teenager who was raped and murdered by a convicted sex offender is questioning how closely police monitored his whereabouts.
Peter Chapman, 33, was jailed on Monday for a minimum of 35 years for the murder of 17-year-old Ashleigh Hall.
Teesside Crown Court heard he posed as a teenage boy on Facebook and met her.
It emerged police had lost contact with Chapman in the months before the crime. Ashleigh's mother, Andrea Hall, said people like Chapman "should be tagged".
Speaking outside court, she said the authorities should have done more to monitor Chapman's whereabouts after his release from prison.
Mrs Hall said: "Them sort of people shouldn't be allowed out into society anyway. I blame them (the authorities) for letting them out.
"He should not have been let out whatsoever and for the people that are supposed to keep an eye on them, they should keep an eye on these sort of people."