Murder is the unlawful killing of a human being:
1. With malice aforethought, either express or implied;
2. Caused by a controlled substance which was sold, given, traded or otherwise made available to a person in violation of chapter 453 of NRS; or
3. Caused by a violation of NRS 453.3325.
Ê The unlawful killing may be effected by any of the various means by which death may be occasioned.