Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 119, § 74

Except as hereinafter provided and as provided in sections fifty-two to eighty-four, inclusive, no criminal proceeding shall be begun against any person who prior to his eighteenth birthday commits an offense against the laws of the commonwealth or who violates any city ordinance or town by-law, provided, however, that a criminal complaint alleging violation of any city ordinance or town by-law regulating the operation of motor vehicles, which is not capable of being judicially heard and determined as a civil motor vehicle infraction pursuant to the provisions of chapter ninety C may issue against a child between sixteen and 18 years of age without first proceeding against him as a delinquent child.

The juvenile court shall not have jurisdiction over a person who had at the time of the offense attained the age of fourteen but not yet attained the age of 18 who is charged with committing murder in the first or second degree. Complaints and indictments brought against persons for such offenses, and for other criminal offenses properly joined under Massachusetts Rules of Criminal Procedure 9 (a) (1), shall be brought in accordance with the usual course and manner of criminal proceedings.