1990 mass shooting in Aramoana, New Zealand
Source (Wikipedia): Aramoana massacre

The Aramoana massacre was a mass shooting that occurred on 13 November 1990 in the small seaside township of Aramoana, northeast of Dunedin, New Zealand. Resident David Gray killed 13 people, including local police Sergeant Stewart Guthrie, one of the first responders to the reports of a shooting, after a verbal dispute between Gray and his next-door neighbour. After a careful house-to-house search the next day, police officers led by the Anti-Terrorist Squad located Gray, and shot and injured him as he came out of a house firing from the hip. He died in an ambulance while being transported to hospital.