I. A person is guilty of a class B felony when he causes the death of another negligently. II. A person is guilty of a class A felony when in consequence of being under the influence of intoxicating liquor or a controlled drug or any combination of intoxicating liquor and controlled drug while operating a propelled vehicle, as defined in RSA 637:9, III or a boat as defined in RSA 265-A:1, II, he or she causes the death of another. III. In addition to any other penalty imposed, if the death of another person resulted from the negligent driving of a motor vehicle, the court may revoke the license or driving privilege of the convicted person for up to 7 years. In cases where the person is convicted under paragraph II, the court shall revoke the license or driving privilege of the convicted person indefinitely and the person shall not petition for eligibility to reapply for a driver's license for at least 7 years. In a case in which alcohol was involved, the court may also require that the convicted person shall not have a license to drive reinstated until after the division of motor vehicles receives certification of installation of an ignition interlock device as described in RSA 265-A:36, which shall remain in place for a period not to exceed 5 years.