The New Hampshire Supreme Court overturned the murder conviction of Adam Montgomery, who was found guilty of killing his 5-year-old daughter Harmony in 2019. The court ruled that combining the second-degree assault and murder charges in a single trial violated his constitutional right to a fair trial. Montgomery’s convictions for abuse of a corpse, tampering with evidence and assault were upheld. The case now returns to lower court for a new trial on the murder charge.
Montgomery, described in court documents as an ex-convict with drug addiction issues, was convicted of brutally killing Harmony and concealing her remains, which have never been recovered. The child was reported missing in January 2021 by her biological mother, who did not have custody and had been estranged from Montgomery. Investigators discovered the girl had been unaccounted for since December 2019.
Court identifies evidence imbalance between charges
The supreme court’s ruling centered on the significant disparity in evidence strength between the two assault incidents. According to the decision, jurors heard powerful testimony about Montgomery beating Harmony months before her death. Three witnesses testified to observing the victim with a black eye in July 2019. Four witnesses, including two who saw the black eye, testified that the defendant admitted striking the child. This created what the court called “a significant risk” that jurors would improperly conclude that because Montgomery assaulted his daughter once by striking her head, he must have done it again in December with fatal results.
The evidence linking Montgomery to the December 2019 incident that allegedly caused Harmony’s death was considerably weaker. Only one witness connected him to that assault: Kayla Montgomery, Adam’s then-wife and Harmony’s stepmother. She received a deal with prosecutors in exchange for her testimony, and the defense challenged her credibility throughout the trial.
December 2019 incident relied on single witness testimony
Prosecutors presented evidence that on December 7, 2019, Harmony soiled herself during sleep. Her father allegedly beat her over the head, telling Kayla Montgomery afterward, “I think I really hurt her this time.” The girl was never seen again after that date. While the state’s case on the July 2019 assault charge was robust with multiple corroborating witnesses, the fatal December incident depended almost entirely on Kayla Montgomery’s account.
The defense strategy focused on discrediting Kayla Montgomery as an unreliable witness. Defense attorneys attempted to shift blame onto her, arguing during trial that she was the last person to see Harmony alive. The court acknowledged this credibility battle played a crucial role in its decision, noting that while multiple witnesses testified about Adam Montgomery’s physical abuse in July, no evidence suggested Kayla had ever physically assaulted the child.
Defense request creates legal complication
The case presented an unusual procedural twist. Montgomery’s defense initially requested the joinder of charges, wanting all counts tried together in a single proceeding. After receiving additional evidence during trial preparation, the defense attempted to have the cases separated. The trial court denied that motion. The supreme court found this sequence of events did not waive Montgomery’s right to a fair trial, particularly given the prejudicial impact of combining charges with vastly different evidence quality.
- Three witnesses saw Harmony with injuries in July 2019
- Four witnesses heard Adam Montgomery admit to striking the child
- Only Kayla Montgomery linked him to the fatal December assault
- Harmony’s body has never been located
- Police arrested Montgomery two years after the child’s death
Adoptive family expresses outrage at ruling
Johnathon Miller and Bob Ward, who adopted Harmony’s brother Jamison, issued a statement expressing their disgust with the supreme court decision. “We are absolutely disgusted by the decision of the New Hampshire Supreme Court,” they said. “The reality is — more protection is in place for this monster than Harmony Montgomery ever received.” Their statement reflects the frustration of those who worked to secure justice for the missing child.
Manchester investigators determined Harmony had been unaccounted for since 2019, despite her father maintaining custody. The biological mother, who was not involved with Montgomery and lacked custodial rights, reported the girl missing when she realized no one had seen her daughter for an extended period. The delay in reporting sparked questions about child welfare oversight.
New trial ordered while other convictions stand
While the murder conviction was overturned, the supreme court maintained Montgomery’s guilt on related charges. His convictions for abuse of a corpse, tampering with physical evidence and assault remain intact. Those convictions carry significant prison time independent of the murder charge. The murder case now returns to a lower court, where prosecutors must decide whether to retry Montgomery on that charge with the evidentiary limitations the supreme court identified.
The ruling highlights ongoing tensions in criminal procedure between judicial efficiency and fairness protections. Prosecutors often prefer consolidated trials to avoid witness burden and inconsistent verdicts. Defense attorneys typically seek separate trials when evidence from one charge might prejudice jurors against their client on another. The supreme court determined that in this case, the prejudicial impact of hearing strong evidence about prior abuse created an unacceptable risk that jurors convicted Montgomery of murder based on character inference rather than proof of the specific December 2019 incident.
