A New Hampshire arrest warrant unsealed Tuesday alleges that Adam Montgomery killed his daughter Harmony, 5, by striking her in the head repeatedly “with a closed fist” when she had bathroom accidents while the family was living in a Chrysler Sebring they’d park outside a Manchester apartment building.

According to the arrest warrant, based on an interview with Kayla Montgomery, Adam Montgomery turned from the driver’s seat, striking his daughter Harmony “with sets of three to four blows with a closed fist to Harmony’s head/face on three separate occasions over the course of a few minutes.”

The date of the alleged assault inside the car was December 7, 2019, according to the arrest warrant.

After the third flurry of blows, Kayla Montgomery told police that Adam Montgomery told her, “I think I really hurt her this time. I think I did something,” according to the document.

Harmony moaned slightly for about 5 minutes after the alleged assault and then fell silent, according to the warrant.

The family returned to parking lot of a Colonial Village Apartments in Manchester where they were living. No one checked on Harmony after the alleged assault, according to the document.

When the family set out again, the Sebring broke down. It was at this time, according to Kayla Montgomery’s testimony as recounted in the warrant, that they discovered Harmony had died.

Adam Montgomery emptied an Under Armour duffle bag he had in the trunk. He then allegedly placed Harmony Montgomery’s lifeless body inside, closed it, and carried it back to the Colonial Village parking lot and away from the broke down car, according to the warrant.

The warrant released tuesday was unsealed after a public records request from WMUR TV in New Hampshire.

Adam Montgomery was convicted by a jury last week on six unrelated charges including two counts each of being an armed career criminal, receiving stolen property, and theft.

He pleaded not guilty in October to second-degree murder, falsifying physical evidence and abuse of a corpse on charges in the alleged murder of Harmony. He’s scheduled for trial in that case in November.

Kayla Montgomery is serving an 18-month prison sentence. She had pleaded guilty to charges that she lied to a grand jury about where she was working the day she last saw Harmony.

Harmony hasn’t been seen since 2019, but authorities didn’t know she was missing until November 2021. Last year, police announced that they believed she was killed in Manchester in early December 2019, a time period that aligns with the events described in arrest warrant unsealed Tuesday.