Detective Senior Sergeant Karen Simmons said emergency services were called to a Burnham School Rd address about 3.05am today after receiving a report of disorder.
RNZ have reported that a relative of the 19-year-old called police after the alleged assault, as she barricaded herself in a room.
It has been reported that police tasered the 19-year-old when they arrived at the scene.
“After arriving at the property, police located the body of a woman.”