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Ms Tolley, who was 30, was shot in her Ward St flat on December 9, 2016.
A 27-year-old was arrested yesterday and is due to appear in the Hutt Valley District Court today charged with murder.
Inspector Scott Miller said with a murder charge now laid, they would be going back to people already spoken to in the investigation.
He said the inquiry remained ongoing.
Inspector Miller said police were pleased that the arrest would help bring some closure to Lois's family and the Upper Hutt community.