WTF? He's on his way to get a job and just thought he'd shoot some guy on the road to break the boredom of driving? Give him a short trial and take him out and shoot him.
It appears he got shot when he “approached the pickup.” Article doesn’t say if he tried to open the door as a hitchhiker normally would, but if some stranger walked up to my car and attempted to open the door, he’d probably be shot if he got it open. I try to keep my range time up to date, though, and I doubt it would be an arm I hit.