If you or a family member is facing assault and battery on a police officer or a similar charge in Boston, and mental illness was part of what happened that day, a brand-new Massachusetts Appeals Court decision matters to your case. On May 12, 2026, the Appeals Court reversed convictions out of the Boston Municipal Court because the Commonwealth failed to prove the accused was criminally responsible at the time of the offense. The decision is Commonwealth v. Brunette-Silveira, and it tightens what prosecutors in Suffolk County must actually put on the record before a fact finder can reject an insanity defense.
Here is what that means in practical terms. Once a Boston criminal defense attorney raises criminal responsibility, the Commonwealth has to prove sanity beyond a reasonable doubt with real evidence, not assumption. Attorney Patrick J. Murphy has handled these cases in BMC and across Suffolk County for more than 27 years, and the new ruling gives the defense meaningful additional leverage.
What the Court Actually Held
The accused was charged with four counts of assault and battery on a police officer under M.G.L. c. 265, § 13D and one count of threatening to commit a crime under M.G.L. c. 275, § 2. The conduct happened at and after the Edward W. Brooke Court House. A defense forensic psychologist testified that the accused was in a manic episode tied to a chronic, major mental illness and lacked the substantial capacity to control his conduct.
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