"10 + years at least. Just my opinion."
Since not calling guaranteed the death of the victim, can anyone explain how a deliberate act (the decision not to call for help) causing death isn't first degree murder?
1st degree would be premeditated. This guy did not plan to kill anyone. He made a terrible mistake, and in not taking responsibility for it probably caused the death of the young man. It's very much like a hit and run, leaving someone to die on the road. I don't know what a typical sentence for that would be, but I suspect less than 10 years.