A critical incident investigation is underway after a Stockton woman died overnight.

Just after 12:30pm yesterday (Thursday the 14th of September, 2023), police were called to a unit complex in Mitchell Street at Stockton, following reports a woman was threatening people with an axe.

When they arrived, the 47-year-old woman allegedly threatened officers with the weapon before barricading herself inside a unit.

A police operation involving specialist tactical officers and negotiators then commenced, with officers finally gaining entry to the property at about 9:45pm.

Police reportedly used a taser to assist in taking the woman into custody.

She was then escorted from the scene in an ambulance, however, her condition deteriorated a short time later, and she was taken to the John Hunter Hospital, where she later died.

A crime scene was established and a critical incident team from the Homicide Squad will now investigate the incident.

The investigation will be subject to an independent review and a report will be prepared for the Coroner.