The Greenough family massacre was the axe murders of Karen MacKenzie and her three children, Daniel, Amara, and Katrina at their remote rural property in Greenough, Western Australia, on 22 February 1993. They were killed by farm hand William Patrick Mitchell, an acquaintance of MacKenzie. Details of the murders were withheld from the public as they were considered too horrific. The case led to calls for the reintroduction of the death penalty.