Another arrest has been made in relation to the killing of a Kapiti Coast man who went missing on 15 May.
The body of Raymond Piper has not been located.
Three people have already appeared in court, with two facing grievous bodily harm charges and another accused of being a party to murder.
A 17-year-old man was arrested on Wednesday morning, also for being a party to murder, and was due to appear in the Porirua District Court.
Detective Senior Sergeant Mike Oxnam says the inquiry team remains focused on finding Mr Piper's body so his family can lay him to rest.