I would think at the very least it should have been vehicular homicide, negligent homicide, or something along those lines. Maybe his brain nugget will get him, who knows, I don't wish the guy harm but he really should have paid for his actions and tried to make amends even though nothing can replace a lost life.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!