Arizona court vacated a U.S. manslaughter sentence, ruling an AI victim video rendered Gabriel Horcasitas's sentencing fundamentally unfair.
PHOENIX, UNITED STATES — An Arizona appeals court has vacated Gabriel Horcasitas's manslaughter sentence, finding an AI-generated depiction of victim Christopher Pelkey rendered his sentencing unfair.
An Arizona appeals court has ordered a new sentencing hearing for Gabriel Paul Horcasitas after concluding that a lifelike artificial intelligence recreation of the man he killed introduced unreliable information into the proceeding and made the sentencing process fundamentally unfair.
The Arizona Court of Appeals Division One left Horcasitas's manslaughter conviction intact but vacated his 10½-year sentence in a unanimous opinion filed on September 30. The ruling draws an important legal distinction between authentic recordings of a deceased victim and AI-generated words, expressions and gestures created after that person's death.
Christopher Pelkey, 37, was fatally shot during a road-rage confrontation in Chandler in November 2021. Horcasitas maintained that he acted in self-defense, but a jury rejected that defence and convicted him of manslaughter.
The controversy emerged at sentencing in May 2025, when Pelkey's family presented a video combining genuine footage of him with an artificial reconstruction of his appearance and voice. The synthetic version addressed the court, Pelkey's relatives and Horcasitas, including a message of forgiveness.
The appeals court did not rule that families may never use technology when describing the consequences of a crime. Instead, its decision focused on the reliability of presenting newly created thoughts and behaviour through the simulated voice and appearance of a person who could neither confirm nor reject them.
Judges Draw a Line Between Authentic Footage and Synthetic Speech
The appellate court's central concern was not simply that artificial intelligence had been used. It was what the technology purported to communicate.
Pelkey's family had genuine photographs, recordings and information about his values and personality. His brother also read words Pelkey himself had written about his spiritual beliefs, aspirations and hopes. The AI portion went further by generating a representation of what Pelkey supposedly would have said at sentencing.
The court found that distinction legally significant.
The synthetic presentation appeared to transform the family's interpretation of Pelkey's likely views into statements delivered by an audiovisual representation of Pelkey himself. That eliminated what the judges described as the necessary distance between what relatives believed he might have said and what the deceased man had actually said during his lifetime.
The court separately held that genuine video footage embedded in the presentation was permissible. The problem arose from the portions that manufactured new speech, facial expressions and other communication and attributed them to Pelkey.
That distinction provides one of the decision's most significant implications for future courtroom uses of generative AI. Technology that reproduces authentic material and technology that creates new conduct may look similar on a screen, but they raise very different questions of reliability.
Sentencing Judge's Reaction Became Central to the Appeal
The AI presentation attracted international attention after the 2025 sentencing partly because Superior Court Judge Todd Lang openly discussed its effect on him.
Lang thanked the family for the presentation and said he regarded the forgiveness expressed by the simulated Pelkey as genuine. His remarks became important when the appellate judges considered whether the video merely appeared during the hearing or actually influenced the sentencing process.
The prosecution had requested a nine-year prison term. Horcasitas's defence sought seven years, emphasising mitigating circumstances including his lack of a prior criminal history. Lang imposed the presumptive 10½-year manslaughter sentence.
The appeals court did not attempt to calculate precisely how much weight the AI presentation carried in that decision. It found that such a calculation was unnecessary because the sentencing judge's comments demonstrated that the video played a role.
Horcasitas had not objected to the presentation during the sentencing hearing, meaning the appellate court reviewed the dispute under the demanding standard for fundamental error. Even under that standard, the three-judge panel concluded that consideration of the synthetic material had prejudiced Horcasitas enough to make the sentencing procedure fundamentally unfair.
That conclusion does not erase the jury's verdict. Horcasitas remains convicted of manslaughter and will return to court for a new sentence.
Arizona Law Gives Victims a Voice but Due Process Sets Limits
The case sits at the intersection of two established principles in Arizona criminal justice: strong protections for victims and the defendant's constitutional right to a fair sentencing procedure.
Arizona law gives crime victims extensive rights to be heard at sentencing. Victim statements are not treated in the same way as ordinary witness testimony. A victim making such a statement is not subject to cross-examination, and conventional trial evidence rules are relaxed during sentencing.
That flexibility, however, does not eliminate reliability requirements.
Sentencing courts can consider a broad range of relevant material, including information that might not be admitted during a jury trial. But due process requires the information used to determine punishment to possess sufficient reliability, because a defendant has a right to be sentenced on an accurate factual basis.
The appellate panel applied that principle to a form of evidence Arizona courts had not previously addressed: an AI-generated depiction of a deceased victim offered as victim-impact material.
The ruling therefore does not eliminate victim-impact statements or diminish the family's right to describe Pelkey, his life or the consequences of his death. Rather, it establishes that synthetic media cannot acquire the authority of the deceased person's own words merely because relatives believe the generated message accurately represents what that person would have thought.
Case Had Already Returned to Court After an Earlier Trial
The AI dispute is only the latest unusual procedural development in a case dating to November 13, 2021.
According to the appellate record, Horcasitas was stopped behind a truck at a red light and repeatedly sounded his horn. Pelkey got out of the truck and moved in Horcasitas's direction while shouting and gesturing. Horcasitas fired, killing him.
Horcasitas told police that Pelkey had charged towards his vehicle, threatened him and grabbed the frame of an open window. Several eyewitnesses gave a different account, saying Pelkey had not advanced beyond the rear of his truck before the shooting and that they did not see him touch or reach into Horcasitas's vehicle.
The first trial produced a manslaughter conviction and one endangerment conviction, but the case was subsequently reopened after a disclosure problem involving material extracted from Pelkey's mobile phone.
The Superior Court found that prosecutors had failed to disclose phone records that could support Horcasitas's self-defence arguments and granted a new trial. The Court of Appeals upheld that decision in 2024.
Before the second trial, the courts again considered whether messages from Pelkey's phone could be introduced. The second jury ultimately convicted Horcasitas of manslaughter after he had pleaded guilty to an endangerment count.
In the latest appeal, Horcasitas again challenged rulings excluding certain text messages. The appellate judges rejected that part of his appeal, meaning the manslaughter conviction survived even though the sentence did not.
The Decision Focuses on Reliability, Not AI as a Category
The ruling is narrower than a general prohibition on artificial intelligence in courtrooms.
The judges specifically noted that no previous Arizona case had addressed an AI-generated depiction of a victim presented as victim-impact evidence. Their analysis concentrated on the synthetic portion of this particular presentation and the way it attributed newly created statements directly to Pelkey.
That leaves numerous other applications of AI unresolved.
Software might, for example, be used to improve the audibility of an authentic recording, organise evidence, produce a demonstrative reconstruction or translate existing speech. Each use raises different questions about authenticity, accuracy and whether the technology is reproducing information or inventing it.
The Pelkey video illustrates why that distinction can become difficult for courts. The presentation mixed genuine recordings with generated content and used Pelkey's appearance and voice to create continuity between them. A viewer therefore encountered real material and synthetic material within the same audiovisual presentation.
The appellate decision effectively treated provenance as crucial: courts must be able to distinguish something a person demonstrably said or did from something generated after death to represent what another person believes he would have said or done.
That issue extends beyond criminal sentencing. As generative systems become increasingly capable of producing convincing voices, faces and gestures, courts will face growing pressure to determine when synthetic media is explanatory and when it begins to assert facts that cannot independently be verified.
Resentencing Will Leave the Manslaughter Conviction in Place
The Court of Appeals affirmed Horcasitas's manslaughter conviction while vacating only the manslaughter sentence and returning the case to the Superior Court for resentencing.
The ruling does not specify the sentence that must be imposed at the new hearing. It instead requires the sentencing decision to be made without relying on the improper AI-generated depiction.
No resentencing date was identified in the appellate opinion.
For Pelkey's family, the ruling revisits a presentation intended to convey the character of a relative who could no longer speak for himself. For the courts, however, the central question was not whether the family's intentions were sincere. It was whether generated words and behaviour could reliably be attributed to a deceased person when another person's liberty was being determined.
The appellate court's answer in this case was no.
The decision leaves Arizona with an early judicial framework for confronting a technology likely to appear with increasing frequency in legal proceedings: authentic photographs, recordings and a person's documented words remain fundamentally different from an artificial reconstruction that speaks new words in that person's voice.
Horcasitas will now be sentenced again. His conviction for Pelkey's death remains intact, while the synthetic version of Pelkey that once addressed the sentencing judge cannot form part of the basis for the new manslaughter sentence.
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