The New Hampshire Supreme Court overturned Adam Montgomery’s second-degree murder conviction in the death of his five-year-old daughter Harmony Montgomery, ruling that prosecutors jeopardized his right to a fair trial by bundling the murder charge with a separate assault count. The state’s attorney general vowed to retry the case.
Montgomery, convicted in 2024 of killing Harmony and concealing her remains, will stay behind bars. His convictions for abuse of a corpse, tampering with evidence, and assault still stand, and a 43.5-year sentence on those charges and prior firearms offenses is unaffected. But the murder conviction, the centerpiece of a case that drew national attention after a little girl vanished from Manchester, New Hampshire, without anyone noticing for more than a year, is now vacated.
The court’s unanimous conclusion was narrow and procedural, but the result is a gut punch to the family members who fought for accountability. The case now returns to a lower court, where prosecutors must prove the murder charge all over again, this time without the evidentiary shortcut the justices found impermissible.
At the heart of the ruling is a question of trial strategy. Prosecutors tried the second-degree murder charge alongside a second-degree assault charge stemming from a separate incident in July 2019. Three witnesses testified they saw Harmony with a black eye that month. Four witnesses, including two who saw the bruise, said Montgomery admitted hitting the child.
The court acknowledged that evidence was strong. “The State’s case on the second degree assault charge was strong,” the justices wrote, as Fox News reported.
But the murder charge rested on thinner ground. Only one witness linked Montgomery to the December 2019 assault that prosecutors believe killed Harmony. Trying both charges together, the court found, let jurors use the well-documented July beating to fill in gaps on the December killing.
The justices spelled it out plainly:
“While the jury heard no evidence that Kayla had ever physically assaulted the victim, it heard evidence from multiple witnesses that the defendant physically assaulted the victim in July 2019. Thus, there was a significant risk that the jury would draw the impermissible inference that because the defendant assaulted the victim before by striking her in the head, he must be the one who fatally assaulted her in December by again striking her in the head.”
That risk, the court concluded, was enough to taint the verdict. “Trying the second degree assault and [second degree murder] charges in a single trial jeopardized the defendant’s right to a fair trial,” the opinion stated.
Michael Garrity, spokesperson for New Hampshire Attorney General John Formella, confirmed the state plans a second murder trial. His statement left no ambiguity about the office’s intent.
“We are disappointed by the Court’s decision to order a new trial on the second-degree murder charge and we plan to pursue a re-trial on that charge.”
Garrity stressed that the ruling does not set Montgomery free. “Adam Montgomery remains convicted of multiple serious felonies arising from Harmony’s death, as well as separate firearms offenses that were previously upheld on appeal,” he said. “Montgomery’s total sentence of 43.5 years for these additional charges stands and is not affected by the Court’s decision today.”
Overturned convictions followed by retrials have become a recurring feature of high-profile criminal cases across the country. The reversal of Alex Murdaugh’s murder conviction in South Carolina followed a similar pattern, a state supreme court finding procedural error significant enough to require a new trial.
Garrity added that the attorney general’s office remains “confident in the facts of this case, the evidence presented, and the exceptional work of our prosecutors, investigators, and law enforcement partners.” He pledged the office would “continue our efforts to seek justice for Harmony Montgomery and all those who knew and loved her.”
Harmony Montgomery was last seen on December 7, 2019. Prosecutors alleged that on that day, after the child soiled herself in her sleep, Montgomery beat her over the head. He allegedly told his then-wife, Kayla Montgomery, “I think I really hurt her this time.”
Harmony was never seen again. Her remains have not been found.
What made the case especially disturbing was the timeline. Investigators in Manchester did not discover Harmony had been unaccounted for until roughly two years later. Police arrested Adam Montgomery in January 2021, after Harmony’s mother reported the girl missing. That gap, a five-year-old child missing for more than a year before anyone in the system noticed, raised hard questions about the state agencies responsible for tracking vulnerable children.
At trial in February 2024, Kayla Montgomery testified against her estranged husband under a deal with prosecutors. The defense challenged her credibility and attempted to shift blame to her, arguing she was the last person to see Harmony alive. The New York Post reported that the court’s reversal was unanimous, underscoring that even the state’s own justices found the trial’s structure fundamentally flawed.
Johnathon Miller and Blair Miller, the adoptive parents of Harmony’s brother Jamison, did not hold back about the ruling.
“We are absolutely disgusted by the decision of the New Hampshire Supreme Court. The reality is, more protection is in place for this monster than Harmony Montgomery ever received.”
That statement captures a frustration familiar to anyone who follows the criminal justice system. Procedural protections exist for good reason, they guard against wrongful convictions and prosecutorial overreach. But when the defendant is someone who remains convicted of abusing and concealing the body of his own child, the abstract principle collides with a visceral sense of injustice.
The legal system has seen similar collisions in recent months. A Supreme Court decision overturning Richard Glossip’s decades-old Oklahoma murder conviction raised parallel questions about the tension between procedural rights and public safety.
The murder case now goes back to a lower court. Prosecutors will have to build their case without the July 2019 assault evidence propping up the December charge, unless they find a way to introduce it under different legal grounds.
That is a real challenge. The court’s own language acknowledged the state’s murder case was weaker than its assault case. With only one witness tying Montgomery to the fatal December incident, and with Harmony’s remains still missing, the retrial will test whether prosecutors can secure a conviction on the thinner evidentiary record.
Montgomery’s defense attorneys, Caroline Smith and James Brooks, had been present for jury selection at Hillsborough County Superior Court in Manchester on February 6, 2024. Kayla Montgomery testified three days later at Hillsborough County Court. The retrial will likely revisit much of the same ground, but under tighter judicial constraints.
Retrials after overturned convictions carry their own complications, as South Carolina’s preparation for the Murdaugh retrial has illustrated. Witnesses age, memories fade, and the prosecution must reassemble its case while the defense has already seen every card in the state’s hand.
For now, Montgomery remains incarcerated. His 43.5-year sentence on the surviving convictions ensures he is not walking free anytime soon. But the murder conviction, the charge that most directly named the killing of a five-year-old girl, has been erased from the record pending a second trial.
The attorney general’s office says it is ready. The family says the system failed Harmony again. And somewhere in Manchester, a little girl’s remains are still waiting to be found.
Courts exist to enforce rules, even when the rules produce outcomes that offend common sense. The New Hampshire Supreme Court did its job. The justices identified a procedural error and applied the law. That is how the system is supposed to work.
But the system that was supposed to protect Harmony Montgomery failed long before any courtroom got involved. A child disappeared for more than a year without triggering a single alarm. The agencies charged with her welfare lost track of her entirely. And now the legal process that was meant to deliver accountability has sent the case back to square one.
High-profile court reversals, whether in constitutional cases before the U.S. Supreme Court or state murder trials, remind us that procedural integrity matters. But procedural integrity without institutional competence is a hollow guarantee. Harmony Montgomery deserved better from every institution that touched her short life, and she has yet to receive it.
Prosecutors say they will try again. They had better get it right this time. Harmony cannot wait any longer.
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