Must I fast for two months after accidentally running over someone with my car and causing their death, even though the court ruling did not stipulate this?

In addition to the blood money (diyyah), the killer is required to offer expiation (kaffarah) in the following order: freeing a believing slave. If he cannot find one, then fasting for two consecutive months. If he is unable to do that, then feeding sixty poor people. He should not move to the next option unless he is incapable of performing the preceding one.