A Utah man whose girlfriend’s body was discovered inside a cardboard box in the trunk of his car has pleaded guilty to her murder, nearly two years after police made the horrifying discovery outside a 7-Eleven.
Jacob Holt Johnson, 42, admitted Thursday, October 22, that he killed 30-year-old Summer Tatiana Roney at their home in Herriman, approximately 20 miles south of Salt Lake City.
The guilty plea brings a major development in a disturbing case that began when officers investigating a possible drunk driver stumbled upon evidence of a violent crime.
As part of an agreement with prosecutors, Johnson accepted a sentence of life in prison without the possibility of parole. His formal sentencing is scheduled for December 17.
The case began shortly after midnight on December 31, 2024, when a Bluffdale police officer noticed a white Jeep parked across several spaces outside a 7-Eleven convenience store.
Inside the vehicle, Johnson was unconscious behind the wheel.
As officers investigated, one noticed something unusual in the back of the SUV. A large cardboard box was sitting in the trunk, and inside was the body of a woman.
The victim was later identified as Roney, Johnson’s girlfriend, who had been living with him in Herriman.
Investigators discovered an extension cord around her neck and injuries consistent with a violent assault.
A search of the vehicle revealed several potentially significant pieces of evidence, including a hammer with blood on it, a hatchet, a knife, a gas can and a bottle of bleach.
What initially appeared to be a routine police encounter had suddenly become a homicide investigation.
When officers questioned Johnson, he acknowledged that he and Roney had been in a relationship and had recently argued about breaking up.
He also admitted placing her body inside the vehicle, according to the original probable cause affidavit.
Detectives quickly determined that the killing had likely occurred somewhere else and turned their attention to the home the couple had shared.
After obtaining a search warrant, investigators entered the Herriman residence and discovered evidence of a violent confrontation.
Prosecutors said blood was found throughout the house, along with indications that someone had attempted to clean the scene.
Officers also recovered a baseball bat from the kitchen floor that appeared to have been recently washed.
The evidence helped authorities reconstruct what happened before Johnson was discovered at the convenience store.
As the investigation continued, detectives interviewed Roney’s relatives and friends, uncovering troubling allegations about the couple’s relationship.
Several people told police that Roney had previously described experiencing verbal and physical abuse by Johnson.
Her family later explained that the relationship had been unstable, with the couple repeatedly separating and reconciling.
One friend reportedly recalled Roney describing an earlier incident in which Johnson placed her in a chokehold.
Those accounts raised concerns about a possible history of domestic violence leading up to her death.
The case took another significant turn Thursday when Johnson appeared in court for what was supposed to be a preliminary hearing.
Rather than proceed with the hearing, he waived that step and pleaded guilty to aggravated murder.
When asked to explain his actions, Johnson made a brief admission.
“I caused the death of Summer,” he told the court.
He acknowledged strangling Roney with an extension cord, although his attorneys disputed allegations that blunt-force injuries caused her death.
Under the plea agreement, prosecutors agreed not to seek the death penalty.
Additional charges, including obstruction of justice, possession of a dangerous weapon by a restricted person and abuse or desecration of a human body, were dismissed as part of the deal.
The agreement came after discussions with Roney’s family, who had made clear that they wanted a punishment ensuring Johnson would never be released from prison.
For her older sister, Michelle Tischner, the case has been an especially painful ordeal.
Tischner previously described Roney as a vulnerable young woman who had difficulty recognizing dangerous situations and needed additional support.
She said the family had been deeply concerned about Johnson’s influence over her sister and the nature of their relationship.
The relatives’ greatest hope was that the legal process would prevent him from harming anyone else.
Their grief was evident during Thursday’s hearing, where several family members and friends became emotional as Johnson admitted responsibility for Roney’s death.
Beyond the disturbing circumstances of the crime, loved ones want Summer remembered for the person she was.
Her family described her as a warm, affectionate woman who brought happiness to those around her.
In her obituary, relatives recalled her love of the color yellow and compared her personality to sunshine, remembering the joy she brought into their lives.
For nearly two years, her family has waited for the criminal case to move forward while mourning a loss that changed their lives.
Now, Johnson’s guilty plea has brought them closer to the resolution they sought.
Salt Lake County District Attorney Sim Gill thanked Roney’s relatives for working with prosecutors throughout the investigation and acknowledged the lasting pain caused by her death.
He also praised Herriman police detectives for their work in building the case.
Johnson is scheduled to return to court December 17, when a judge will formally impose his sentence.
Under the agreement, he is expected to spend the rest of his life in prison without the possibility of parole.
For Roney’s loved ones, the guilty plea brings accountability for a killing that began with a shocking discovery outside a convenience store.
But while the legal proceedings are nearing their conclusion, the family continues to mourn a 30-year-old woman whose life ended far too soon.
Must a been Dave, You know, There once was a man name of Dave, who kept a dead wh*re in his cave. He said “What the He11 I’ll get used to the smell. Just think of the money I’ll save”!