Harmony Montgomery

Adam Montgomery trial Day 3 recap: What we learned from Harmony Montgomery's stepmom's testimony

Kayla Montgomery gave graphic testimony about the death of 5-year-old Harmony Montgomery in 2019 on the second day of the murder trial against her estranged husband, Adam Montgomery

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Editor’s note: Some of the details described in the story below may be disturbing for readers.

The estranged wife of Adam Montgomery offered chilling testimony on the second day of his trial in the murder of his 5-year-old daughter, Harmony Montgomery.

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Kayla Montgomery, who faces legal woes of her own, recounted disturbing details about how her stepdaughter died.

Kayla Montgomery, the stepmother of Harmony Montgomery, took the stand as a key witness in the murder trial of her husband, Adam Montgomery. She detailed how, to her recollection, Adam beat his daughter Harmony to death. (NOTE: The details described in the testimony are graphic and may be disturbing.)

Appearing under a plea agreement, the 33-year-old woman said her husband became increasingly angry with Harmony's bathroom accidents. On Dec. 7, 2019, the young girl wet herself in the vehicle the family was living in when the couple went to methadone clinic.

"When Adam came back to the vehicle, he could smell urine, and he started yelling at Harmony, and kept hitting her in the head," she testified.

She says the assault only became more vicious as the family drove to Burger King.

A key witness took the stand Friday morning in the Harmony Montgomery murder trial. Kayla Montgomery, Adam Montgomery's estranged wife and Harmony's stepmother, is currently serving time in prison for perjury after allegedly lying to a grand jury about where she was when Harmony was last seen. On Friday, she testified about the time since getting custody of Harmony and until after her death between 2019 and 2020.

"I put my arm up and said to stop, but he looked at me, and he gave me this look that was, like, evil," Kayla Montgomery said in court.

She says the couple only realized Harmony was dead when the car broke down after they had stopped to do drugs.

"He, like, folded her in half and put her in the duffel bag," she said through tears.

After the youngster died, Kayla Montgomery says the family moved in with her mother, keeping the child's body in a cooler. They then went to a family shelter, where her body was placed in the ceiling, she says. Next, they were in an apartment in Manchester, where Adam Montgomery is accused of trying to dismember the remains, which have never been found.

Prosecutors laid out a disturbing story of how Adam Montgomery killed Harmony by hitting his daughter after she soiled herself. They say the man then transported the young girl’s body from place to place in a duffel bag for months to cover up the crime. But the defense argues someone else is responsible for her death. Follow NBC10 Boston on... Instagram: instagram.com/nbc10boston TikTok: tiktok.com/@nbc10boston Facebook: facebook.com/NBC10Boston X: twitter.com/NBC10Boston

She says she never said anything because Adam Montgomery threatened to kill her.

"And nobody would be able to find me," Kayla Montgomery testified.

The day in court ended early after Kayla Montgomery complained of a migraine. Attorneys for Adam Montgomery, who was not in court Friday, spent the afternoon trying to discredit her story, arguing that she's lying and is the one responsible for Harmony's death.

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