A motion for new trial in Massachusetts asks a judge to undo a conviction or guilty plea when justice may not have been done. It is the main way to challenge a case after it is over — not by going to a higher court, but by going back to the trial judge and showing that something went wrong the first time. If the judge agrees, the conviction or plea can be thrown out and the case reopened.
Here is how it works, when it applies, and why getting it right the first time matters so much.
What a Motion for New Trial Can Do
The standard is broad on purpose. A judge can grant a new trial whenever “justice may not have been done.” That covers far more than simply disagreeing with a jury’s verdict.
Common grounds include:
Ineffective assistance of counsel — your lawyer’s work fell below what a competent attorney would have done, and it hurt your case.
Other constitutional violations — evidence that should have been suppressed, a coerced or uninformed plea, or a trial that was unfair for some other reason.
Newly discovered evidence — facts that were not available before and could have changed the outcome.
A motion for new trial is not only for cases that went to a jury. It is also the proper way to take back a guilty plea. When a plea was the product of bad advice, pressure, or a lawyer who never did the work, a judge has the power to vacate it.
Attorney Matthew W. Peterson recently won a Motion for a New Trial in Middlesex Superior Court in Lowell, demonstrating how this legal tool can provide a second chance when a conviction should be challenged. The Law Office of Matthew W. Peterson has successfully obtained this type of relief for clients throughout Massachusetts.
Is There a Deadline?
No. There is no time limit to file a motion for new trial in Massachusetts. The rule lets a judge grant one at any time — even years after a case ends.
But timing is not the real trap. Strategy is.
Why You Usually Get One Real Shot
The courts strongly discourage filing more than one motion for new trial. Any argument you leave out of your first motion is generally treated as waived, which means you lose the right to raise it later. A judge can refuse to hear new grounds in a second motion. In practice, that makes your first motion your best — and often only — real chance at relief.
This is why the work behind the motion matters so much. A strong motion means digging through the entire history of the case, identifying every viable argument, and presenting them together. Discovering a better argument after the door has closed does you no good. One shot, done right, beats several done in pieces.
Why You Need a Lawyer for This
A motion for new trial is not a form you fill out. It requires a written motion with specific grounds, supporting affidavits, and a clear, persuasive account of what went wrong and why it matters. Judges do not like to revisit closed cases, so the burden is on you to show that justice may not have been done — and to show it convincingly.
That takes someone who can read the full record, spot the errors a previous lawyer missed, and put together every argument worth making before that one opportunity is gone.
Talk to Us About Your Case
If you believe justice was not done in your case — your lawyer failed you, your rights were violated, or you pleaded guilty without ever getting a real defense — call us. We will review what happened and tell you honestly whether you have a path forward.
The Law Office of Matthew W. Peterson offers free consultations on criminal cases. Call or text us at 617-295-7500, or send us a message below.
