The Caleb Rees manslaughter sentence handed down on 17 July 2026 in Utah’s Fourth District Court in Provo closes a prosecution that the Salt Lake Tribune has described as the first of its kind in the United States.
Rees, 31, pleaded guilty to reckless manslaughter with a domestic violence enhancement, two counts of possession of a firearm by a restricted person, and one drug-related charge in connection with the death of Rena Nguyen, 20, in Orem on 1 October 2021.
Judge Sean M. Petersen imposed up to five years on each of the four counts, leaving Rees facing a theoretical maximum of 20 years in custody.
The Caleb Rees Manslaughter Sentence and What the Court Heard
Nguyen, a biology student at Brigham Young University who hoped to train as a radiologist, had secretly recorded her phone during the hours leading up to her death, capturing her final interactions with Rees, according to the Utah News Dispatch.
That recording became the foundation of the prosecution. Investigators working for Nguyen’s family found it on her phone some three years after her death, and charges were filed only after the family had spent more than two years pressing Utah County authorities to act.
The audio captured Rees confronting Nguyen about her suicidal thoughts. When he believed she had called police, he demanded she end the call. ‘When I say get the f (off the phone with the police, I mean get the f) off the phone,’ he said, as reported by the Salt Lake Tribune. A friend had in fact placed the call to request a welfare check.
Rees continued, calling Nguyen dumb and stupid and telling her she should be placed in a ‘mental institution.’ Her final recorded words were a plea: ‘Stop, please!’
Rees then placed a firearm on a table in front of Nguyen and left the room. Moments later she shot herself. She died on 3 October 2021 in hospital from a gunshot wound to the head; the Orem Police Department declared her death a suicide, according to reporting by ABC4.
Prior Allegations and the Road to Prosecution
The relationship between Nguyen and Rees had already been marked by violence before the night of 1 October. Nguyen had accused Rees of domestic violence and sexual assault, and had left their shared home at some stage to stay in a shelter, according to Fox 13.
Investigators also established that Rees knew Nguyen was in a mental health crisis on the day she died. She had sent a friend a message earlier that day threatening to take her own life, and Rees was aware of those communications.
The two had been together for approximately 10 months at the time of her death. Rees entered his guilty plea roughly three months before the July sentencing hearing.
Judge Petersen’s remarks from the bench were direct. Calling the recording ‘nothing short of horrific,’ he told Rees: ‘The repeated threats, demeaning statements, and the ridicule, Mr. Rees, that you heaped upon Rena is just unnerving. To treat someone this way, whom you had a close relationship with, gives me a lot of pause about your future relationships and the safety of the public.’
Defence attorneys argued that Rees had changed since 2021. The judge rejected that framing, stating plainly that he regarded Rees as a risk to the public, according to KSL.
Nguyen’s parents, Keith and Rose Nguyen, addressed the court directly. Rose Nguyen told the judge that her daughter had dreamed of becoming a radiologist. ‘We stand before you today carrying a pain no parent should ever endure,’ she said. ‘We are Keith and Rose Nguyen, and our daughter Rena Nguyen should still be alive. Rena should be building her future; instead, we are here to speak for Rena.’
The family had fought for prosecution for years before the private investigator’s discovery of the phone recordings finally moved prosecutors to act, a sequence the Utah News Dispatch documented in full.
Subject to any appeal, the Caleb Rees manslaughter sentence now stands as the first conviction in the United States in which a defendant was held criminally liable for manslaughter in circumstances where his conduct contributed to a partner’s suicide. Whether prosecutors in other states pursue comparable charges under analogous statutes will determine whether this case remains an outlier or becomes a precedent others choose to follow.
