(a) Offense defined.--A person who kills an unborn child without lawful justification commits voluntary manslaughter of an unborn child if at the time of the killing he is acting under a sudden and intense passion resulting from serious provocation by:
(1) the mother of the unborn child whom the actor endeavors to kill, but he negligently or accidentally causes the death of the unborn child; or
(2) another whom the actor endeavors to kill, but he negligently or accidentally causes the death of the unborn child.
(b) Unreasonable belief killing justifiable.--A person who intentionally or knowingly kills an unborn child commits voluntary manslaughter of an unborn child if at the time of the killing he believes the circumstances to be such that, if they existed, would justify the killing under Chapter 5 (relating to general principles of justification) but his belief is unreasonable.
(c) Penalty.--The penalty for voluntary manslaughter of an unborn child shall be the same as the penalty for voluntary manslaughter.