1.  A person found guilty of murder in the first degree who was under the age of eighteen at the time of the commission of the offense shall be sentenced to a term of life without eligibility for probation or parole as provided in section 565.034, life imprisonment with eligibility for parole, or not less than thirty years and not to exceed forty years imprisonment.

 2.  When assessing punishment in all first degree murder cases in which the defendant was under the age of eighteen at the time of the commission of the offense or offenses, the judge in a jury-waived trial shall consider, or the judge shall include in instructions to the jury for it to consider, the following factors:

Terms Used In Missouri Laws 565.033

  • Conviction: A judgement of guilt against a criminal defendant.
  • Defendant: In a civil suit, the person complained against; in a criminal case, the person accused of the crime.
  • following: when used by way of reference to any section of the statutes, mean the section next preceding or next following that in which the reference is made, unless some other section is expressly designated in the reference. See Missouri Laws 1.020
  • person: may extend and be applied to bodies politic and corporate, and to partnerships and other unincorporated associations. See Missouri Laws 1.020
  • Probation: A sentencing alternative to imprisonment in which the court releases convicted defendants under supervision as long as certain conditions are observed.
  • Trial: A hearing that takes place when the defendant pleads "not guilty" and witnesses are required to come to court to give evidence.

 (1)  The nature and circumstances of the offense committed by the defendant;

 (2)  The degree of the defendant’s culpability in light of his or her age and role in the offense;

 (3)  The defendant’s age, maturity, intellectual capacity, and mental and emotional health and development at the time of the offense;

 (4)  The defendant’s background, including his or her family, home, and community environment;

 (5)  The likelihood for rehabilitation of the defendant;

 (6)  The extent of the defendant’s participation in the offense;

 (7)  The effect of familial pressure or peer pressure on the defendant’s actions;

 (8)  The nature and extent of the defendant’s prior criminal history, including whether the offense was committed by a person with a prior record of conviction for murder in the first degree, or one or more serious assaultive criminal convictions;

 (9)  The effect of characteristics attributable to the defendant’s youth on the defendant’s judgment; and

 (10)  A statement by the victim or the victim’s family member as provided by section 557.041 until December 31, 2016, and beginning January 1, 2017, section 595.229.