The New Hampshire Supreme Court has reversed the second-degree murder conviction of Adam Montgomery, the Manchester father found guilty in 2024 of killing his 5-year-old daughter Harmony and concealing her body for months before disposing of it. In a unanimous ruling issued Thursday, the justices concluded that combining the murder charge with a separate assault charge in a single trial created an unacceptable risk to Montgomery’s right to a fair trial, and they sent the most serious count back to the lower court. According to reporting from WBUR and The Associated Press, the court left Montgomery’s other convictions intact and the state has already announced it will seek a new trial on the murder charge.
For a state that followed every turn of the Harmony Montgomery case for years, the decision lands hard. It does not declare Adam Montgomery innocent, it does not release him from prison, and it does not erase the jury’s other findings. What it does is reopen a wound that many New Hampshire residents believed had finally closed, and it forces prosecutors to prove the central allegation all over again.
What the Court Actually Decided
Montgomery was convicted in February 2024 of second-degree murder, second-degree assault, falsifying physical evidence, witness tampering, and abuse of a corpse. In May 2024 a judge sentenced him to a minimum of 56 years in prison. The murder count alone accounted for 45 of those years, layered on top of an earlier 32 and a half year sentence Montgomery was already serving on unrelated federal firearms charges.
The appeal turned on a question of trial procedure rather than guilt or innocence. Montgomery’s lawyers argued that the assault charge, which stemmed from an incident in July 2019 in which he was accused of striking Harmony in the head, should never have been tried alongside the murder charge tied to her death in December 2019. The justices agreed. They found that the evidence supporting the assault was strong and came from multiple witnesses, while the evidence supporting the murder was substantially weaker and rested largely on the testimony of one person, Montgomery’s wife Kayla Montgomery.
In their written opinion, the justices warned of what they called an impermissible inference. “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,” they wrote. In plain terms, the court concluded that jurors may have leaned on the well-supported assault evidence to fill the gaps in the weaker murder evidence, and that the law does not permit a conviction to rest on that kind of reasoning.
The Supreme Court reversed the murder conviction and remanded it for further proceedings, while affirming the convictions for assault, falsifying evidence, witness tampering, and abuse of a corpse. Those remaining counts stand.
Montgomery Will Not Walk Free
One point deserves emphasis, because it is the question most readers will ask first. Adam Montgomery is not getting out of prison. He remains incarcerated on the 32 and a half year federal firearms sentence that predates the murder case entirely, and the assault and evidence-related convictions that the high court upheld carry their own penalties. The reversal removes the 45-year murder component from his sentence, but it does not open the prison door.
The New Hampshire Department of Justice moved quickly to signal that the fight is not over. “We remain confident in the facts of this case, the evidence presented, and the exceptional work of our prosecutors, investigators, and law enforcement partners,” said spokesperson Michael Garrity. “We will continue our efforts to seek justice for Harmony Montgomery and all those who knew and loved her.” Montgomery’s attorneys did not respond to requests for comment.
How the Case Reached This Point
Harmony Montgomery was 5 years old when investigators believe she was killed in December 2019, roughly two years before anyone reported her missing. Her body has never been found. Adam Montgomery had been awarded custody of his daughter in early 2019, a decision that later drew intense scrutiny of the state agencies that handled her case.
Montgomery did not attend his 2024 trial, and his lawyers called no witnesses in his defense. They conceded that he was guilty of falsifying evidence and abusing a corpse, but maintained that he did not kill Harmony, suggesting instead that the girl died while alone with her stepmother. The prosecution’s case relied heavily on Kayla Montgomery, who had served an 18-month sentence for lying to a grand jury about Harmony’s whereabouts. She testified that Adam Montgomery beat Harmony to death on December 7, 2019, while the family was living in their car, then hid the body in a car trunk, a homeless shelter ceiling vent, and a walk-in freezer at his workplace before disposing of it in March 2020. She also testified that he beat her and grew increasingly paranoid that she would go to police.
The criminal case has run alongside a series of civil and governmental reckonings. Last year the state agreed to pay $2.25 million to Harmony’s mother, Crystal Sorey, to settle a lawsuit alleging that social workers ignored signs of abuse after Montgomery gained custody. This spring, a Hillsborough County judge issued a multimillion-dollar wrongful death judgment against Montgomery, a civil chapter that ran on a separate track from the criminal appeal. Readers can revisit that civil ruling in our earlier coverage of the $15.5 million wrongful death judgment against Adam Montgomery.
What a Retrial Would Mean for New Hampshire
A second murder trial would be a significant undertaking. Prosecutors would need to rebuild their case, likely relying again on Kayla Montgomery’s account, and they would do so knowing the Supreme Court has flagged the murder evidence as comparatively thin. The defense, for its part, will enter any new trial with a roadmap of the weaknesses the high court identified.
For New Hampshire families, the ruling is a reminder that the machinery of justice does not always move in a straight line. The procedural protections that produced this reversal exist to guard every defendant against conviction by association, even in cases that provoke profound public anger. The state’s challenge now is to honor those protections while still pursuing accountability in the death of a child who, in the words of investigators and advocates alike, was failed by the systems meant to protect her. The Harmony Montgomery case has already reshaped how the state talks about its child protection agencies, a theme that runs through much of our continuing coverage of New Hampshire’s child welfare and accountability debates.
No retrial date has been set. Until one is, Adam Montgomery remains in prison on the convictions and sentences that survive, and the question of who is legally responsible for Harmony’s death is, once again, formally unresolved.
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