Police say a special multi-agency group that's goal is to prevent family violence and protect victims never did a threat assessment of a violent serial stalker who went on to kill weeks after being released from prison. That's despite Canterbury police knowing the man's criminal history and that he was in their District. Nathan Boulter stabbed the woman 55 times as she returned to her Christchurch home with her two children in July. Canterbury police, District Commander Superintendent Tony Hill spoke to Lisa Owen.

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