On December 7, 2019, the Montgomery family was driving around Manchester, New Hampshire when five-year-old Harmony had a bathroom accident in the back seat. According to testimony later given under oath by her stepmother Kayla, Adam Montgomery turned around and beat his daughter repeatedly with his fists until she lost consciousness. He did not stop to get help. He drove around the city for several more hours.
When he finally checked on her, she was dead.
He did not call an ambulance. He did not call the police. He opened the trunk of the car, retrieved an Under Armour duffel bag, and put her inside it. Then he drove on.
Nobody would ask where Harmony was for nearly two more years.
Harmony survived what doctors predicted
Harmony Montgomery was born on June 7, 2014, to Crystal Sorey and Adam Montgomery. She was diagnosed at birth with holoprosencephaly, a rare condition in which the brain fails to fully divide into two hemispheres. Doctors told Sorey that Harmony was blind in both eyes and unlikely to survive her first year.
She proved them wrong. Her foster mother later noticed movement in one of her eyes. Some of her vision returned. Placed with a foster family in August 2014 after Sorey’s drug addiction led to her removal from the home, Harmony began to thrive in ways her doctors had not anticipated. The foster family grew attached to her. There was quiet discussion of permanent adoption.
She was, by every account from those early years, a happy and resilient child. She had fought harder to survive before she could walk than most people face in a lifetime.
Adam had been violent for years
Adam Montgomery was born in January 1990. By the time he and Crystal Sorey began a relationship in August 2012, his criminal record already included charges for leaving the scene of a traffic accident, possessing a firearm on school grounds, pulling a knife on a 15-year-old girlfriend, and stabbing a teenager in the leg over a drug dispute.
In February 2008, he was suspected of shooting and killing a man inside a Massachusetts convenience store. No charges were filed due to insufficient evidence.
In January 2014, while Sorey was three months pregnant with Harmony, the two traveled to Massachusetts to buy drugs. When Montgomery believed he had been sold a counterfeit batch, he shot the dealer in the head. The dealer survived. Sorey was found hiding in an abandoned shed in below-freezing temperatures while pregnant. Montgomery evaded police for two weeks before surrendering. He received an 18-month sentence and was still behind bars when Harmony was born in June 2014.
A custody hearing sealed Harmony’s fate
By February 2017, Crystal Sorey had completed parenting classes and been assessed as stable enough to regain custody of Harmony. The conditions included no contact with Adam Montgomery. She violated that condition almost immediately, and by January 2018 had lost custody of her daughter for the third time.
A hearing was scheduled for February 2019 to determine where Harmony, now four years old, would live. Sorey had been ordered to appear at a simultaneous custody hearing for a different child in a different case. She attended that one instead. Montgomery arrived at the Harmony hearing with his wife Kayla and their two young sons.
Adam Montgomery was awarded sole custody.
Harmony was four years old and had spent roughly 40 hours of her entire life in her biological father’s presence.
Montgomery moved Harmony across state lines to Manchester, New Hampshire, where the family lived at 77 Gilford Street. He blocked Sorey on his phone and across every social media platform. When she created new accounts to reach her daughter, he blocked those too. In the entirety of Harmony’s time in his care, Sorey was permitted to FaceTime her daughter on two occasions. The last was Easter 2019. In that call, Sorey later said, Harmony seemed different. More timid. More withdrawn. Frightened, she thought, of her father.
That was the last time Crystal Sorey would ever see her daughter alive.
Between the family’s arrival on Gilford Street and October 2019, police were called to the address approximately 30 times, roughly once a month. In July 2019, Adam’s uncle Kevin moved out and reported to child services that he had seen Harmony with a black eye. When he confronted Montgomery about it, Montgomery reportedly admitted to having “bashed her around the house.” Montgomery and Kayla denied everything to authorities and characterized Kevin as a bitter former tenant.
Child protective services visited the property and noted additional unexplained marks on Harmony’s body. They accepted the explanation that the children played rough.
A final welfare visit in October 2019 produced a positive report. The case was closed.
Seven weeks later, Harmony was dead.
Adam moved her body for three months
The family’s circumstances had collapsed in the weeks before December 2019. Kayla had lost her job. They had been evicted from Gilford Street on November 27. All five of them were living out of their Chrysler Sebring through a New Hampshire winter, and Adam and Kayla were smoking crack cocaine.
On December 7, after the beating in the car, after the hours of aimless driving, Montgomery confirmed his daughter was dead. According to Kayla’s testimony, his first words were: “I think I really hurt her this time. I think I did something.” He did not take her to a hospital. He retrieved the duffel bag and put her in it.
What followed across the next three months was among the most deliberate acts of concealment in the case record. The family moved into a friend’s vehicle, leaving the Sebring to be towed. Harmony’s body remained in the duffel bag, sometimes in the car’s trunk, sometimes left out on the cold tarmac. When the family later stayed with Kayla’s mother, the bag was placed in a small red cooler and left in the hallway outside the apartment, where neighbours walked past it every day.
When they moved into the FIT Shelter near Manchester in late December, Montgomery climbed onto a chair, removed a vent cover, and pushed her body into the ceiling cavity. The shelter was heated. The bag began to leak. When the smell spread through the building and neighbours complained, maintenance workers came to inspect the ceiling. Montgomery had already wrapped the remains in additional garbage bags. He was not identified.
At some point during this period, Montgomery transferred Harmony’s remains into a maternity tote bag. According to Kayla’s testimony, she then pushed that bag to the Portland Pie Company on Elm Street in Manchester, tucked between their two young sons in a double stroller, at Adam’s request. The bag was stored in the restaurant’s walk-in cooler for about a week while Adam worked his shifts.
When the family later moved into an apartment on Union Street, Montgomery brought the remains with him and stored them in the freezer. He subsequently spent hours in the bathroom applying lime to the remains in an attempt to accelerate decomposition and compress what was left into a smaller container. An employee at Portland Pie Company later told investigators he had noticed the bag in the cooler on a few occasions and had never asked about it.
At 1 a.m. on March 3, 2020, Montgomery loaded the remains into a rented U-Haul van. Toll cameras at the Tobin Bridge in the Boston area recorded him failing to pay on three separate passes through the night. He returned to the apartment around 5 a.m. and said two words to Kayla: “It’s done.”
To this day, Harmony’s body has never been recovered.
Crystal called police in November 2021
In January 2020, a child protective services worker visited the Montgomery family at their shelter and noticed the family of five was now a family of four. Montgomery told the worker that Harmony had gone to live with her mother in Massachusetts. DCYF left a voicemail for Crystal Sorey asking her to confirm Harmony’s address. Sorey did not return the call. Nobody followed up.
For nearly two more years, Harmony’s absence went unexamined by any official body.
In November 2021, Sorey contacted child services and pushed for a proper follow-up. Investigators confirmed quickly that Harmony was not enrolled in school, not registered with any doctor, and not listed at any known address. Police were notified. When they located Adam Montgomery and began questioning him, the body camera footage of that encounter captured a man cycling through contradictory explanations in real time, each one contradicting the last, as officers calmly waited.
On January 4, 2022, Montgomery was arrested, not for murder, but for the 2019 assault that Kevin had reported to authorities years earlier. Kayla was separately arrested for welfare fraud after investigators established she had continued collecting Harmony’s food stamps for months after her stepdaughter’s death. The fraud charge gave investigators the leverage they needed. Kayla accepted a plea deal and provided a full account.
When investigators returned to the Manchester shelter and examined the ceiling cavity, they found Montgomery’s fingerprints on the panels and recovered Harmony’s DNA from the sheetrock. Harmony’s DNA was also recovered from the U-Haul’s interior.
In February 2024, Montgomery stood trial for Harmony’s murder. He maintained his innocence on the murder charge, with his attorneys acknowledging guilt on two lesser counts: purposely concealing and falsifying evidence related to her corpse. He pointed instead to Kayla as the person responsible for Harmony’s death. The jury convicted him.
On May 9, 2024, he was sentenced to 45 years to life for the murder of his daughter. That sentence ran alongside a 32-year sentence he was already serving on separate firearms convictions. Kayla Montgomery was sentenced to three and a half years and was released in May 2024.
On March 12, 2024, Harmony Montgomery was legally declared dead.
On June 11, 2026, the New Hampshire Supreme Court issued a 15-page ruling overturning Montgomery’s murder conviction. The justices found that trying the second-degree assault charge, arising from the July 2019 black eye incident, alongside the murder charge in the same trial had jeopardized his right to a fair trial. The murder conviction was reversed and sent back to Superior Court. His convictions for second-degree assault, falsifying physical evidence, witness tampering, and abuse of a corpse were all upheld. The New Hampshire Attorney General’s Office stated it will seek a retrial on the murder charge.
In May 2025, the state of New Hampshire settled a wrongful death lawsuit from Crystal Sorey for $2.25 million, acknowledging serious failures in how child protective services had handled Harmony’s case across multiple agencies and multiple years. In May 2026, a civil court found Montgomery liable for Harmony’s death and ordered him to pay $15.5 million in damages.
He remains in a Virginia prison. He has not been cleared of murder. He has simply been granted another trial, another procedural chance at the charge, while the evidence of what he did to his daughter, and what he did with her afterward, sits in the court record unchanged.
Harmony Montgomery has no grave. Her remains are believed to be scattered across multiple locations in the Boston area, disposed of in the dark hours of a winter night by a man who was supposed to be her father. She was five years old. She had survived a diagnosis that doctors said should have killed her before her first birthday. She beat those odds, and the people the state placed in charge of her afterward made certain she had no others to beat.
