For those of us searching for possible reasons for the double murders of Libby and Abby, the following murder that was solved earlier in February in Queens, NY, of Karina Vetrano brings out an interesting theory. She was out jogging on Aug 2, 2016 when she disappeared. Her body was discovered a few hours later.
Basically, the accused murderer 20 yr old Chanel Lewis, who was arrested for the murder, says he just snapped, saw her and starting beating her.
http://nypost.com/2017/02/06/jogger-murder-suspect-i-strangled-her-because-i-was-angry/
This is a very simple solution to a violent crime. No rhyme or reason. Lewis was angry, issues at home, he saw her and just went crazy. She was in the wrong place at the wrong time.
Maybe something as simple as this could be the scenario for Libby and Abby's deaths. I'm not saying it was, just throwing this out there for thought. MOO