In a tragic case that has gripped Utah, a young man has been sentenced for his involvement in the death of his younger brother. Tyler Peterson, 23, was handed a sentence of five years to life in prison for the child abuse homicide of 12-year-old Gavin Peterson. This verdict was delivered on Tuesday, marking a somber chapter in a heartbreaking family saga.

Earlier, in May 2025, the boys’ father, Shane Peterson, aged 47, and their stepmother, 50-year-old Nichole Lea Scott, were also sentenced for their involvement following guilty pleas. Their roles in the tragic event underscored a deeply troubling family dynamic that culminated in Gavin’s untimely death.

During the sentencing, Fox affiliate KSTU provided detailed coverage from inside the courtroom, where the extent of the abuse inflicted upon Gavin by his brother was laid bare. The biological mother of the boys, through her lawyer, implored for leniency for Tyler, arguing that he had been manipulated and “brainwashed” by the family environment.

Judge Camille Neider, while acknowledging Tyler’s role in the events, remarked on his shared culpability. She stated, “I have no evidence that you didn’t know right from wrong based on the circumstances,” but also noted, “It’s very clear you weren’t the alpha” in this distressing family scenario.

A poignant letter from the boys’ mother was read aloud in court, where she expressed belief in Tyler’s innocence if left to his own devices, asserting he had been under undue influence since childhood. Tyler’s defense attorney, Ryan Bushell, highlighted his client’s account of the “horrific nature” of life within the household.

In a related development, during Nichole Lea Scott’s sentencing, it was revealed by prosecutors that school nurses had informed her of Gavin’s infection in 2023. Scott’s response was a text to Shane Peterson, filled with expletives, indicating a troubling lack of empathy towards the boy, reflecting deeper issues within the family dynamics.

Gavin was never seen in school again. Prosecutors said the boy was forced to live in one room of the house without a bed, no access to the bathroom, and half a glass of water a day with a piece of bread with mustard, if he was fed at all. He was forced to wear a diaper, which was often soiled. Prosecutors said Gavin was subjected to “nothing short of a prolonged death camp” while in the home.

However, prosecutor Kevin McGaha told the court that Tyler Peterson was an active participant. He cited texts that he sent to Scott that listed what abuse the victim’s older brother had inflicted on Gavin, including beatings and making the younger boy hold his bladder. McGaha recounted how the family left Gavin and Tyler Peterson by themselves while the rest of the family went to Disneyland. During the trip, he “reported incidents of mental and physical torture” to Scott.

At the time of his death, “Gavin was found with multiple bruises on his body from beatings,” McGaha told the court. “Some pictures recovered show Tyler kicking and beating Gavin all on his own.”

Prosecutors said during Scott’s sentencing that on the day Gavin died, after he was found unresponsive, Tyler Peterson and Scott “hid surveillance cameras, removed other items from the room, and removed and replaced the doorknob in an effort to mislead the police and hide the abuse and isolation that had been happening in the home” before calling 911.

The boy’s cause of death was reported to be complications from sepsis, with contributing factors including pneumonia, dehydration and untreated infections. His body had also shown signs of starvation and several other physical wounds.

Tyler Peterson was sentenced to five years to life for child abuse homicide, one to 15 years for two counts of aggravated child abuse, and one to 15 years for obstruction of justice. The sentences will be served concurrently, and he gets credit for 246 days served.