CATHERINE BIRNIE
Most couples enjoy going on long walks or cooking dinner together. But for notorious killers Catherine and David Birnie, their shared hobby was a penchant for murder.
The Perth pair murdered four women in the 1980s. It began with the slaying of 22-year-old student Mary Neilson, who arrived at the Birnie home to buy some tires. Upon walking into their home, Neilson was held at knifepoint, bound, and chained to the bed.
There, Neilson was repeatedly
