David John Birnie (16 February 1951 – 7 October 2005) and Catherine Margaret Birnie (born 23 May 1951) were an Australian husband and wife pair of serial killers from Perth, Australia. They murdered four women ranging in age from 15 to 31 in their home in the 1980s, and attempted 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, Western Australia.
David and Catherine Birnie murdered the following women:
- Mary Neilson, aged 22
- Susannah Candy, aged 15
- Noelene Patterson, aged 31
- Denise Brown, aged 21
Their final victim, Kate Moir, aged 17, survived.