[MeneMeneTekelUpharsin]

From watching the video, she is very, very immature. She appears to be emotionally very volatile. Both of them should not be traveling across the country having (most probably) immoral sexual relations, as this would further deteriorate her already fragile emotional state. She was probably feeling used and this led up to the conflict.

More than likely he left her walking down the highway and a sexual predator picked her up, you know what happened next and then killed her.

[Toespi]

The police are investigating a connection to the double murder, in the same area where they found the bodies several days after this domestic episode.