Rebecca Fincham Davis met Gary Lee Davis while he was locked up behind the bars. She knew he was a very dangerous individual and that was part of his appeal. However, she allowed him to come into her life and change it completely. Their relationship and marriage was certainly an odd one because Gary Lee Davis didn't escalate to killing someone before they started seeing each other. Something in Rebecca made him push his limits even further. Perhaps it was his own sexual frustration or Rebecca herself.
While we have the evidence that proves what this killer couple did, Gary Lee Davis' changing stories never truly revealed what exactly happened in Colorado in 1986. All we know is that a young woman was viciously killed by this violent couple.