One of New Zealand’s most violent murderers is set to appear before the Parole Board for the first time this week.

Clayton Weatherston was sentenced to life in prison with a minimum non-parole period of 18 years for the murder of his ex-girlfriend Sophie Elliott in 2008.

Weatherston is now eligible for parole, but Sophie's father, Gil Elliott, says he hasn't availed himself of any rehabilitation measures.

"I maintain that his mental state, when he went in, will be the same as his mental state now after 18 years. Why would it be any different?"

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