(1) A person is guilty of murder when:
(a) With intent to cause the death of another person, he causes the death of such person or of a third person; except that in any prosecution a person shall not be guilty under this subsection if he acted under the influence of extreme emotional disturbance for which there was a reasonable explanation or excuse, the reasonableness of which is to be determined from the viewpoint of a person in the defendant's situation under the circumstances as the defendant believed them to be. However, nothing contained in this section shall constitute a defense to a prosecution for or preclude a conviction of manslaughter in the first degree or any other crime; or (b) Including, but not limited to, the operation of a motor vehicle under circumstances manifesting extreme indifference to human life, he wantonly engages in conduct which creates a grave risk of death to another person and thereby causes the death of another person.
(2) Murder is a capital offense.