Notwithstanding any other provision of law:
1. All proceedings for Class A, B and C crimes must be prosecuted by indictment, unless indictment is waived, in which case prosecution must be as the Supreme Judicial Court provides by rule;
2. All proceedings for murder shall be prosecuted by indictment; and
3. The District Courts have jurisdiction to try civil violations and Class D and E crimes and to impose sentence in Class A, B and C crimes in which the District Court has accepted a plea of guilty.