What Is a Motion for New Trial in Massachusetts?

A motion for new trial allows a defendant to reopen a criminal case after conviction when justice may not have been done. This motion is governed by Rule 30(b) of the Massachusetts Rules of Criminal Procedure and gives the trial court the power to correct serious mistakes that affected the outcome of the case.

Common reasons for filing a motion for new trial include newly discovered evidence, ineffective assistance of counsel, or constitutional violations. For example, if new witnesses come forward, or if evidence surfaces that the prosecution failed to disclose, you may be entitled to a new trial. Likewise, if your lawyer failed to investigate important evidence or made serious errors during trial, that can also be grounds for relief.

The motion must include an affidavit explaining the reasons for the request and any supporting documentation. In many cases, the judge will hold an evidentiary hearing to evaluate the claims. If the motion is allowed, the conviction is vacated and the case may be retried or dismissed, depending on the circumstances.

A motion for new trial is often filed after the direct appeal has been decided, especially when the issue involves facts outside the trial record. It is one of the most powerful tools for correcting wrongful convictions, but it requires careful preparation and strong supporting evidence.

If you believe something went wrong in your case that was never addressed, a motion for new trial may offer a path to justice. Speaking with an attorney who handles post-conviction work can help determine whether your situation qualifies.