An official report says the Corrections Department has consistently under-estimated the risk posed by the killer of an elderly Auckland man in a road rage attack.
Bio O'Brien is days away from being let out of jail, after serving his full sentence for the manslaughter of 78-year-old Jasmatbhai Patel in 2009.
Mr Patel died from head injuries sustained in the attack, which followed a minor crash in the Auckland suburb of Mt Albert.
The Parole Board says O'Brien's risk has been consistently under-estimated by the Corrections Department, which made just one programme available to him during his sentence.
The Parole Board says it is a matter of urgency he undertakes a so-called maintenance programme before leaving jail on 7 April.
O'Brien is subject to release conditions for six months once he leaves prison.