MO SB790

Changes first degree murder definition from "crime" to "offense" and establishes that offenders aged 18 or older face death penalty or life imprisonment without parole or release except by governor action

Creates new sentencing requirements for offenders under 18: those 16 or older at time of offense face life without parole or a minimum 50-year sentence; those under 16 face life without parole or a minimum 35-year sentence

Requires prosecutors to file notice of intent to seek life without parole sentences for juvenile offenders before sentencing and establishes factors for courts to consider including victim impact, community impact, defendant's age and maturity, and prior rehabilitation efforts

Allows individuals previously sentenced to life without parole as juveniles whose cases are not final on appeal to file motions within six months of the law's effective date for resentencing hearings under the new provisions

Declares sections relating to murder definitions and juvenile sentencing as emergency measures effective upon passage and approval; changes to aggravating circumstances become effective January 1, 2016