The victim's name would not be released until police were sure all family members had been informed.
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A post mortem examination would occur tomorrow and a team of police experts would continue to piece together information.
Detectives and forensic specialists were examining two scenes in Christchurch, Sweeney said, one in Exeter St and one in Breezes Rd.
Two vehicles have been seized in relation to the case and police are appealing for anyone in the wider area who might have seen or heard anything suspicious on Friday or Saturday to get in touch.
The accused will appear in the Christchurch District Court tomorrow.