Boston Officer’s Manslaughter Charge Raises Questions About Supreme Court Use-of-Force Standard
Why It Matters
The manslaughter prosecution of a Boston Police officer for a fatal shooting in Roxbury has drawn attention not just as a local law enforcement matter, but as a test of how state criminal charges interact with binding Fourth Amendment constitutional standards governing police use of force across the country. Legal analysts say the Suffolk County District Attorney’s public framing of the case omits a critical dimension that the U.S. Supreme Court has made mandatory in evaluating officer conduct.
What Happened
Officer Nicholas O’Malley fatally shot Stephenson King in Roxbury in March after officers located King less than a mile from the scene of a reported carjacking. According to police, King ignored commands, attempted to flee, maneuvered his vehicle, and struck a police cruiser. O’Malley fired three shots, later stating he believed his partner was about to be hit by the car King was driving.
Suffolk District Attorney Kevin Hayden filed a manslaughter charge against O’Malley before seeking a grand jury indictment — an uncommon procedural step in police shooting cases. The DA’s public explanation centered on whether O’Malley’s perception of danger was reasonable, drawing on body-worn camera footage, witness accounts, and officer interviews.
The Constitutional Framework the Charge Must Clear
What the district attorney’s public explanation largely omits, according to legal experts, is the constitutional framework that governs every use-of-force case in the United States. The Supreme Court established that standard in Graham v. Connor — decided more than three decades ago — and reaffirmed it in Barnes v. Felix, a ruling handed down in 2025.
Under that framework, the central legal question is not whether the officer was ultimately correct in his assessment, or whether prosecutors reviewing evidence after the fact find his judgment mistaken. The standard asks whether a reasonable officer, facing the same rapidly evolving and uncertain circumstances, could have perceived an immediate threat and responded similarly. Critically, the standard permits honest, reasonable mistakes.
Graham identified specific factors courts must weigh: the severity of the suspected crime, whether the individual posed an immediate threat, whether there was active resistance, and whether the suspect was attempting to flee. Although Graham arose from a civil lawsuit, Massachusetts courts have applied its reasonableness standard in criminal cases through the doctrine of justification, requiring juries to be instructed that officers are justified in using force that is “necessary and reasonable.”
In Barnes v. Felix, Justice Elena Kagan wrote that courts “cannot review the totality of the circumstances” if they apply what she called “chronological blinders” — meaning courts must consider everything leading up to the use of force, not just the precise moment the trigger was pulled.
By the Numbers
- 3 — shots fired by Officer O’Malley during the encounter
- 30+ — years since Graham v. Connor established the federal use-of-force standard
- 2025 — year the Supreme Court reaffirmed that standard in Barnes v. Felix
- Up to 15 years — maximum prison sentence for carjacking under Massachusetts law
Where the DA’s Framing Falls Short
A retired Massachusetts judge and constitutional law instructor argues that the DA’s public comments place disproportionate weight on the fact that King was “unarmed” at the moment of the shooting — a framing that risks sidelining factors the Supreme Court has explicitly required be considered. Those include the severity of the carjacking that preceded the encounter, the reported assault of the carjacking victim, King’s alleged flight, his failure to comply with commands, and the collision with the police cruiser.
To prevail on the manslaughter charge, the Commonwealth must prove beyond a reasonable doubt either that O’Malley did not genuinely believe his partner faced an imminent threat, or that any such belief — even if sincerely held — was not objectively reasonable under the circumstances. That is a demanding evidentiary bar shaped directly by Supreme Court precedent. Federal law enforcement funding has also been a flashpoint as agencies navigate overlapping legal obligations in the field.
What’s Next
The case will now proceed through Massachusetts courts, where O’Malley is expected to assert a justification defense grounded in the Graham standard. Jury instructions will likely become a central battleground, as the constitutional reasonableness framework — not the DA’s public characterization — will ultimately govern what jurors are asked to decide. Legal observers note the outcome could carry implications for how prosecutors in Massachusetts and other states publicly frame use-of-force cases before trial.