GINNI WOOD, KELLY GASKINS, AND ERVIN WILLIAMS
Kelly and Ervin are planning to move to Mexico, and Kelly asks her friend Ginni for her help in the process. They arrive in Mexico, and somehow Kelly convinces Ginni to stay with them in Mexico. Ginni agrees. It's Ervin's idea to go to Mexico, as he feels that it will result in an easier life for him, and he convinces his girlfriend Kelly to go with him, who agrees and in turn convinces Ginni to stay with them. A domino effect of sorts. Several days after they arrive, Ervin, with the two girls, tries to make a deal with a group. Drugs come into play here, and Ervin gets a "rude awakening", which in turn effects the two girls he's with. Yes, they were murdered in Mexico and will likely never be found.
Analysis: The motive here is drugs, and it's likely that a drug cartel killed these three execution style. Ervin convinced the other two that it would be easier and more simple in Mexico than in the US, which turned out not to be true.