A Utah man has been sentenced to prison after pleading guilty to manslaughter and other charges in connection with the 2021 death of his girlfriend, a Brigham Young University student. The case drew renewed attention after audio recordings recovered years later became key evidence for prosecutors.
Caleb Rees, 31, pleaded guilty to manslaughter, two firearm-related charges, and one drug-related charge in the death of Rena Nguyen, 20. A judge sentenced him on Friday to up to five years on each count, meaning he could serve up to 20 years in prison, depending on how the sentences are carried out under Utah law.
Investigation Reopened After New Evidence Emerged
Nguyen, a biology student at Brigham Young University, had been in a relationship with Rees for about 10 months before her death on Oct. 1, 2021, in Orem.
According to reports, prosecutors did not initially pursue a manslaughter charge. About three years later, a private investigator hired by Nguyen’s family recovered audio recordings from her cellphone that captured events leading up to her death. Those recordings became central to the prosecution’s case.
Recordings Captured Verbal Abuse
According to prosecutors, the recordings documented a heated confrontation between Rees and Nguyen.
Authorities said Rees mistakenly believed Nguyen had contacted police regarding concerns for her safety. Investigators later determined that it was actually a friend who had requested a welfare check.
Prosecutors said Rees continued to insult and demean Nguyen during the argument, calling her names and telling her she belonged in a mental institution. During the exchange, Nguyen repeatedly pleaded with him to stop.
The recordings were later presented as evidence during the criminal proceedings.
Guilty Plea to Manslaughter
Court records show that Rees ultimately pleaded guilty to manslaughter and the related firearm and drug charges.
The guilty plea resolved the criminal case without a trial.
Judge Criticizes Defendant’s Conduct
During sentencing, Judge Sean M. Petersen strongly criticized Rees after reviewing the evidence.
The judge described the recordings as deeply disturbing and said the repeated threats, insults, and degrading remarks directed toward Nguyen were alarming. He also expressed concern about how Rees treated someone with whom he had a close relationship and said the behavior raised concerns about future public safety.
Family Speaks at Sentencing
Nguyen’s parents addressed the court during the sentencing hearing, describing the lasting impact of losing their daughter.
Her mother said Rena had hoped to become a radiologist and should have been building her future instead of having her family speak on her behalf in court.
Her father said no parent should have to endure the loss of a child under such circumstances.
Civil Lawsuit and Private Investigation
Following Nguyen’s death, her family filed a negligence lawsuit against the Orem Police Department, alleging officers had not done enough to address earlier complaints involving Rees.
The lawsuit was later dismissed.
The family then hired a private investigator, whose review of Nguyen’s cellphone uncovered the recordings that prosecutors later relied upon in bringing the manslaughter charge.
Defendant Apologizes
Before sentencing, Rees apologized to Nguyen’s family.
He told the court he wished he had handled the situation differently and acknowledged that he could never fully understand the pain experienced by Nguyen’s loved ones.
Prison Sentence
Caleb Rees was sentenced to up to 20 years in prison after pleading guilty to manslaughter and related firearm and drug offenses.
The case underscores the significant role that newly discovered digital evidence played in the prosecution years after Nguyen’s death.
If you or someone you know is struggling with thoughts of suicide or emotional distress, support is available through local crisis services or a mental health professional. Reaching out to someone you trust can also be an important first step.
