A rape prevention expert says adult sex offenders should be treated the same way as child sex offenders.
Dagmar Pytlickova, 31, was found dead in a South Canterbury forest on Sunday, next to a Waimate man, Jason Frandi, 43, who was jailed in 2000 for abducting a young woman for intended rape.
Rape Prevention Education programme executive director Kim McGregor says sex offenders like Frandi usually show behaviours in their teenage years that have not been picked up and dealt with.
She said this crime might have been prevented if Frandi had completed a one to two year treatment programme.
But treatment programmes of one to two years for a crime like this one, are not in place.
Dr McGregor says treatment programmes in New Zealand deal only with sex offenders against children, not adults.