Providing that a person who is convicted of murder in the first degree may be sentenced to death under certain circumstances; providing that the murder of a law enforcement officer, a correctional officer, a certain first responder, or a certain witness, or a certain mass murder, under certain circumstances, is an aggravating circumstance that the court or jury must consider in making a determination as to the imposition of the death penalty; establishing procedures for the imposition of the death penalty; etc.