Yes.
In his truck?
Even better. Makes hauling off his dead carcass easier.
This kind of thing happens all the time, and will continue to happen regardless of CCW in any State.
Of the 31 "Shall Issue" states, can you cite one example of something like that happening?
Yes.
You will go to jail for (minimum) manslaughter, possible 2nd-degree murder. In ALL States, it is illegal to shoot ANYONE in the back, as they are not a threat if they are walking/running away.
Same-o with shooting in his truck--more jail time unless he was pointing the weapon OR the truck at you.
Easy. About 3 months, ago, factory shoot-em-up in Mississippi. About 2 months ago, another factory shoot-em-up in Indiana.
Happens all the time.