Where a person is punishable under the Code, and also under any other statute, or under 2 or more sections of the Code or of any other statute, he may be tried and punished under the Code or such other statute or under either of such sections, as the case may be; but he shall not be punished twice in respect of the same act or omission, unless his act or omission renders him guilty of unlawfully causing the death of any person, and such death occurs after he has been once punished.