On a winter evening in January 2023, Angelina Marie Harrison, a 16-year-old girl from Cheyenne, Wyoming, climbed into a car with people she knew, expecting nothing more than another night of riding around town. A student at Triumph High School, she was remembered as outgoing, loyal, smart and caring, a teenager who loved hanging out with friends, going to car meets and shows, doing her makeup, shopping, and spending time with her parents, brother and her dog Draco.
She talked about becoming either a defense attorney or a cosmetologist someday, dreams that made her family proud and gave shape to a future she never had the chance to live.
On January 9, 2023, shortly after 6 p.m., Angelina rode in the front passenger seat of a car traveling west along Dell Range Boulevard near Cheyenne's Frontier Mall. Behind her sat two young men, 19-year-old Tirso Munguia and 18-year-old Cody Nicholson, while 26-year-old Sarah Heath drove. At some point during the drive, Nicholson set his handgun and a magazine on the seat between himself and Munguia and warned him, “Be careful, there's one in the head,” a reminder that a round was already chambered. Despite the warning, Munguia picked up the gun, pointed it toward the front of the car where Angelina sat, and pulled the trigger. The shot struck her in the neck as the car moved along the busy commercial strip, instantly turning an ordinary ride into a fatal shooting.
In the chaotic moments that followed, the decisions made inside that car deepened the tragedy. Heath pulled the vehicle into the parking lot of a nearby urgent care clinic, passing a fire station on the way, but no one rushed inside to call for immediate medical help. According to Angelina's father, they sat there while his daughter lay bleeding and struggling to breathe, and instead of seeking aid, those in the car focused on what story they might tell to avoid consequences. Heath then drove away from the clinic onto back roads and stopped again so Nicholson, who had an outstanding warrant for a probation violation on an earlier DUI charge, could take the gun and flee on foot. Nearly nine minutes passed from the time Angelina was shot before 911 was finally called, and by then the car had reached the Frontier Mall parking lot, where first responders found her gravely wounded. Medical professionals later told the family that the gunshot had not severed major arteries or damaged her spine, and that if she had received prompt treatment, her chances of survival might have been good. Instead, an autopsy concluded that she died from complications of blood loss and asphyxiation after aspirating her own blood, effectively suffocating in the seat where she had been chatting with friends only minutes before.
Police officers converged on the mall after the call reporting a shooting. They found the car and a teenage girl with a gunshot wound, and she was pronounced dead at the scene. Earlier, a Cheyenne Police Department news release described how four people had been riding in the vehicle: two in the front, two in the back, with the suspects handling a gun before the shot was fired. Nicholson, according to investigators, ran from the vehicle with the firearm when it first pulled over and disappeared into the surrounding neighborhood, leaving his friend bleeding in the front seat. Tips from community members and an intense search led police to him later, and he was booked into jail on the outstanding DUI-related probation warrant and on a charge of accessory after the fact to manslaughter. Munguia, who admitted firing the shot, was arrested and booked on a manslaughter charge.
As the investigation unfolded, a third person was drawn into the criminal case. Sarah Heath, the driver, was arrested a little over a week later and accused of having supplied alcohol to minors and possessed marijuana on the night of the shooting. Prosecutors charged her with accessory after the fact to manslaughter, three counts of providing alcohol to minors, and misdemeanor marijuana possession. Court records and later testimony painted a picture of a night that had started with drinking and riding around and ended with a terrified, mortally injured teenager left without timely help while adults lied to police. According to police and court accounts, when officers first questioned Heath and Munguia, they both denied knowing Nicholson and steered suspicion toward him as the shooter, adding another layer of deception to the case and forcing investigators to spend hours tracking Nicholson down.
Angelina's family, meanwhile, was left to piece together what had happened from police briefings and court hearings. District officials at Laramie County School District 1 issued a letter to Triumph High School families acknowledging the loss of one of their students and offering counseling to classmates struggling with grief. An obituary and local coverage described how a funeral service was held at First Congregational Church in Cheyenne, and community members were invited to honor her memory with donations in her name. Friends and relatives organized online fundraisers to help the Harrison family with expenses, describing the shooting as a parent's worst nightmare and speaking of Angelina as a “princess” and an “angel” whose absence had left a hole that could not be filled.
As charges moved through the courts, the legal story of Angelina's death began to unfold. Prosecutors ultimately pursued a case that framed the shooting as involuntary manslaughter rather than intentional murder, a decision that disappointed some members of her family but set the boundaries for what judges could impose. Tirso Munguia pleaded guilty in May 2023 to involuntary manslaughter for firing the fatal shot. While out on bond, he was accused of violating release conditions, including attending a car show where he encountered Angelina's parents, which removed some of the sentencing protections he might have gained through his plea agreement. In September 2023, Judge Edward Buchanan sentenced him to 15 to 20 years in prison, saying that the severity of the crime, along with his irresponsibility and deception, made probation “wholly inappropriate.” The judge also ordered him to pay restitution and told him that although no punishment could bring Angelina back, he hoped the sentence would deter others from similar recklessness.
Sarah Heath chose to resolve her case by pleading guilty to accessory after the fact to manslaughter, the alcohol charges, and marijuana possession. In August 2023, she was sentenced to 32 to 36 months in prison for the felony accessory count, with three consecutive 180-day terms for supplying alcohol to minors and another 180-day term for marijuana, that last sentence running concurrently with one of the alcohol counts. All told, her sentence amounted to roughly four and a half years of incarceration at the Wyoming Women's Center in Lusk. In a later interview and social media post highlighted by local news, Angelina's father argued that the sentence was too light given Heath's choices the night of the shooting — driving past a fire station, stopping at an urgent care without going inside, allowing the gun's owner to flee, and helping craft a false story, all while his daughter was dying beside her. He insisted that medical professionals believed Angelina might have survived had she received immediate help and bluntly concluded that Heath's actions “killed my daughter,” even if the law labeled her an accessory.
Cody Nicholson's case moved more slowly, but by mid-2023 he, too, had pleaded guilty to accessory after the fact to involuntary manslaughter. In November 2023, he faced Judge Buchanan for sentencing. The judge imposed a prison term of two to three years, rejecting probation and calling Nicholson “not an appropriate candidate” for supervision in the community. In court, Nicholson apologized and told the Harrison family that he was “super sorry” and wished he could go back and change what had happened. Angelina's parents, however, told the court that, in their eyes, he was deeply responsible for her death: he had brought the gun into the car, found a way to acquire it despite his age, warned that it was loaded, and then fled with it instead of staying to help, leaving their daughter to bleed out. The judge acknowledged that nothing he could order would truly address the gravity of the crime but urged Nicholson to honor Angelina by living an exemplary, law-abiding life once he is released, doing what she would never have the chance to do.
Even after the criminal sentences were handed down, the community's remembrance of Angelina continued to evolve. A memorial grew in front of Frontier Mall, near where she had been fatally shot, with flowers, photos, and mementos placed by friends, classmates, and strangers. Her mother, Amanda Harrison, shared that the memorial had become a place of comfort, and a petition to keep it in place gathered more than 2,500 signatures. In September 2023, on the same day Munguia was sentenced, the mall's management informed the family that the memorial would have to be removed by the end of the month because it stood on private property. The family thanked supporters and began considering other ways to honor her, determined that even if the physical memorial came down, the story of a bright teenager lost to a preventable act of recklessness would not fade so easily from Cheyenne's memory.
