MANSLAUGHTER, INVOLUNTARY - In order for a person to be found guilty of involuntary manslaughter the government must prove that someone was killed as a result of an act by the person;
Second, in the circumstances existing at the time, the person's act either was by its nature dangerous to human life or was done with reckless disregard for human life; and
Third, the person either knew that such conduct was a threat to the lives of others or knew of circumstances that would reasonably cause the person to foresee that such conduct might be a threat to the lives of others.
All three apply when driving a vehicle with a drivers license.
This could carry some considerable jail time > 5 years depending on the circumstance.
If there were circumstances like the car had some kind of failure and lost control he might be clear. Otherwise his lawyer is looking at an uphill battle.
Of course a lawyer is the first person you should ask. a couple hundred bucks for a consultation could make a big difference in the outcome of the case.