Montana Title 45. Crimes § 45-5-102. Deliberate homicide

(a) the person purposely or knowingly causes the death of another human being;

(b) the person attempts to commit, commits, or is legally accountable for the attempt or commission of robbery, sexual intercourse without consent, arson, burglary, kidnapping, aggravated kidnapping, felonious escape, assault with a weapon, aggravated assault, or any other forcible felony and in the course of the forcible felony or flight thereafter, the person or any person legally accountable for the crime causes the death of another human being; or

(c) the person purposely or knowingly causes the death of a fetus of another with knowledge that the woman is pregnant.