Warning: This article contains graphic details in the investigation of the death of Harmony Montgomery.

MANCHESTER, NH – An affidavit containing details in the investigation of the death of a Manchester girl who was reported missing in 2019 has been unsealed.

Adam Montgomery has been charged with second degree murder in the death of Harmony Montgomery. Harmony was reported missing in December 2021, but had reportedly not been seen since December 2019. In August 2022, the New Hampshire Attorney General’s Office and Manchester Police shifted from a missing person investigation to a homicide investigation.

The document was unsealed following a motion by WMUR-TV, on the condition that it be unsealed 10 days after Adam Montgomery’s weapon’s trial.

The affidavit states that investigators believe that Adam Montgomery killed Harmony by punching her several times in the face or head on December 7th, 2019. It contains details obtained from interviews with Adam’s ex-wife and Harmony’s step mother Kayla Montgomery.

According to the document, Kayla admitted to lying in her grand jury testimony when she said that she last saw Harmony two days before Thanksgiving in 2019. Later, Kayla said that she and Adam, along with Harmony and two other children were living in their car, and Adam frequently became angry with Harmony over having bathroom accidents in the car.

On the morning of December 7th, 2019, the family was in their car on their way to a fast food restaurant when Adam allegedly turned around and punched harmony a few times. Following the alleged assault, Kayla said Adam told her that he felt or heard something, and thought he had “really hurt her this time.”

Kayla told police that Harmony began to moan for about five minutes then stopped. Police said nobody checked on Harmony or rendered any first aid. After leaving the restaurant, the car broke down, and Kayla said that is when they discovered that Harmony was dead.

Adam allegedly kept Harmony’s body in a duffel bag in the trunk of a friends car that they were borrowing, or put it in the snow. Three weeks later, the Montgomery family moved into an apartment at Families in Transition, where Harmony’s body, in a trash bag, was placed above a ceiling vent in the bedroom.

That apartment was searched last summer, where detectives access the ceiling and discovered staining and a persistent smell that other residents had complained about.

Harmony’s body has also allegedly been kept in a walk-in freezer for a week at a restaurant in Manchester where Adam Montgomery worked as a dishwasher.

Later, the family moved into another apartment on Union Street in Manchester, where Adam allegedly used lime on Harmony’s body and repackaged it to fit inside a refrigerator. Kayla said that Adam used a U-Haul to take the remains somewhere during the Spring of 2020, and didn’t tell her where.

Harmony’s body has not been found.