Section 2. (a) Except as provided in subsection (b), any person who is found guilty of murder in the first degree shall be punished by imprisonment in the state prison for life and shall not be eligible for parole pursuant to section 133A of chapter 127.
(b) Any person who is found guilty of murder in the first degree who committed the offense on or after the person's fourteenth birthday and before the person's eighteenth birthday shall be punished by imprisonment in the state prison for life and shall be eligible for parole after the term of years fixed by the court pursuant to section 24 of chapter 279.
(c) Any person who is found guilty of murder in the second degree shall be punished by imprisonment in the state prison for life and shall be eligible for parole after the term of years fixed by the court pursuant to section 24 of chapter 279.
(d) Any person whose sentence for murder is commuted by the governor and council pursuant to section 152 of chapter 127 shall thereafter be subject to the laws governing parole.