The break in sounds like it might have been staged. Did they find any forensic evidence from the break in?
Did anybody see Kind of vehicle the girls returned to the house in? Did someone drop them off? Was there any forensic evidence obtained from his vehicle?
Are there girls still living in his house? How long were they together before this incident happened?
Was there any kind of history of violence between the couple prior to the one witnessed? Alcohol or drug use?
What did the neighbors and his friends and family have to say about him personally?
Have any seaches for James been done in the area between his house and where the truck was found?
Does the ex-girlfriend have any family or ties to the local community? Anyone that might help her out? A boyfriend or family member?