Murder + Horrific = Murderific. 

This dastardly duo from Perth, Australia met as teenagers and then reconnected as adults. Together, they kidnapped, raped, and murdered four young women in their home at 3 Moorhouse Street, which was dubbed the Moorhouse Murders.

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Sources-

http://serialkillercentral.blogspot.com/2010/06/david-and-catherine-birnie-bonnie-clyde.html

https://www.news.com.au/national/crime/david-and-catherine-birnie-the-macabre-and-sadistic-moorhouse-murderers/news-story/d1937accb6dfdbb6cc89074e7eb7c241

https://www.mrandmrsmurder.com/home/ep3-david-and-catherine-birnie

https://vlmckay.wordpress.com/2020/03/02/the-moorhouse-murders-david-and-catherine-birnie/