Missouri Revised Statutes Title XXXVIII. Crimes and Punishment; Peace Officers and Public Defenders § 565.033. Person under eighteen, sentencing--factors to be considered, jury instructions

(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.