MO SB200

Establishes separate sentencing provisions for individuals convicted of first-degree murder who were under 18 at the time of the offense: those 16 or older face life without parole or a minimum 50-year term; those under 16 face life without parole or a minimum 35-year term

Prohibits the death penalty for defendants under 18 at the time of the offense, limiting death penalty eligibility to those 18 or older

Allows individuals sentenced to life without parole before the bill's effective date for offenses committed as juveniles (whose cases are not final on appeal) to file a motion within 6 months for resentencing review

Adds "murder in the first degree" to the statutory definition of "dangerous felony" in Missouri criminal code

Includes an emergency clause for immediate effect upon passage for sections relating to juvenile murder sentencing, responding to U.S. Supreme Court rulings on unconstitutional juvenile sentencing