Harmony Montgomery Case: Docs Say Wife Claims Husband Killed Daughter

CONCORD, NH — Filings in Hillsborough County Superior Court North by the New Hampshire Attorney General’s Office revealed that the stepmother of Harmony Montgomery, who is facing a slew of felony charges, is the key witness in the murder case against her father, Adam Montgomery.

Prosecutors filed a seven-page state motion in court after Adam Montgomery’s legal team petitioned to have Kayla Montgomery’s testimony kept out of the case. The counter-petition stated much of the information was gathered by detectives as they were running dual investigations — one involving stolen firearms and the disappearance of Harmony Montgomery. There are multiple witnesses to the gun theft charges after Kayla Montgomery initially claimed not to know about the weapons, the filing said.

But after she was arrested on perjury charges, based on statements she made to a grand jury, “Kayla provided new information about the defendant and firearms which was contrary to her initial statements, and which inculpated the defendant with respect to the instant case.”

Also, during interviews with the Manchester police, Kayla Montgomery admitted to police that Harmony Montgomery was murdered in December 2019 by her father, the filing said.

“Kayla also said that the defendant had encouraged her on multiple occasions to lie to police about Harmony’s whereabouts,” the filing said, “basically giving Kayla a ‘cover story’ and telling her that as long as she stuck to the cover story everything would be OK.”

Investigators attempted to keep the issues of the stolen guns and the missing girls separate, but there was “significant bleed-over between the topics,” the prosecutor said.

The information shared by Kayla Montgomery led investigators to search a home on Union Street where the family formerly lived earlier this year, taking materials and appliances while searching for clues to the case.

Earlier this month, the state disclosed Kayla Montgomery’s interview information to the defense team not as “some sort of scheme to gain an unfair advantage over the defendant” but “to balance the state’s desire to protect the Harmony Montgomery investigation with the ultimate deadline for witness statements in the case (state by state statute).”

Adam Montgomery was charged on Monday with second-degree murder, abuse of a corpse, tampering with evidence, and witness tampering charges.

Investigators accused Adam Montgomery of "repeatedly striking Harmony Montgomery in the head with a close fist in Manchester" on Dec. 7, 2019. The evidence and abuse of corpse charges were based on being accused of moving her body to impair an investigation on Dec. 7, 2019, and March 4, 2020. The tampering with witnesses or informants charge was an accusation that Adam Montgomery attempted to cause Kayla Montgomery, his wife, "to testify or inform falsely" between Dec. 7, 2019, and Jan. 4.

At the time of the murder, the family was living out of a car.

According to the New Hampshire Union Leader, police asked imamates at the Valley Street Jail to “get information” about the Harmony Montgomery case. The newspaper also reported Danielle Dauphinais, who is also being held in the jail, accused of killing. her son, Elijah Lewis, 5, of Merrimack, between 2020 and 2021, “volunteered to seek out and share any information” Kayla Montgomery was stating about the case while in the jail.

Dauphinais is expected to be called as a witness in the case.

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