Pukekohe massacre
1992 CE.
Shown on the map at -37.167°, 174.871°.
The Schlaepfer family murders was a familicide that took place in Paerata, New Zealand on 20 May 1992. A 64-year-old Brian Schlaepfer murdered six members of his family on their Paerata farm before he shot himself. The massacre was one of the most high-profile familicide shootings in New Zealand's history.
Text from the Wikipedia article Schlaepfer family murders, licensed CC BY-SA 4.0.