Harmony MontgomeryPhoto: Manchester, N.H. Police
Updated 6/11/2026 12:56 p.m.
CONCORD, N.H. (WBZ NewsRadio) — The New Hampshire Supreme Court Thursday overturned the murder conviction of Adam Montgomery in the death of his daughter, Harmony Montgomery.
The court ruled there was a procedural error when Montgomery was tried in 2024, saying the charges of second-degree assault and second-degree murder should have been tried separately.
Harmony disappeared in 2019 when she was 5 years old, but was not reported missing until 2021. Investigators allege Montgomery beat her to death in December of 2019 before hiding, and then disposing of her body, which has never been found.
In 2024, a jury found Montgomery guilty of killing Harmony, along with charges of second-degree assault, witness tampering, falsifying physical evidence, and abuse of a corpse. He was sentenced to 56 years in prison.
In an appeal, Montgomery's lawyer argued that because the assault charge stemmed from a separate incident from earlier in 2019, it did not allow for a fair trial. The New Hampshire Supreme Court overturned his murder conviction, but upheld his other convictions including for assault.
In a statement to WBZ NewsRadio, the New Hampshire Attorney General's Office said it was "disappointed" by the court's decision and that they "plan to pursue a re-trial" on the charge of second-degree murder. The Office also said the decision does not affect his total sentence of 43.5 years for the other convictions in this case as well as separate firearms offenses.
"We remain confident in the facts of this case, the evidence presented, and the exceptional work of our prosecutors, investigators, and law enforcement partners. We will continue our efforts to seek justice for Harmony Montgomery and all those who knew and loved her," the Attorney General's Office said.