David and Catherine Birnie

David John Birnie and Catherine Margaret Birnie (16 February 1951 – 7 October 2005) (née Harrison; born 23 May 1951) were an Australian couple from Perth who murdered four women at their home in 1986, also attempting to murder a fifth. These crimes were referred to in the press as the Moorhouse murders, after the Birnies' address at 3 Moorhouse Street in Willagee, a suburb of Perth.