Retiring Third District Juvenile Court Judge David L. Johnson’s most notable case on the bench centered on a high-profile murder prosecution of a Salt Lake County teenager known publicly as Emiliano, in which the judge issued a series of unprecedented rulings that vacated a plea deal, disqualified the entire Salt Lake County District Attorney’s Office, and ultimately dismissed the charges with prejudice.
Johnson, who was appointed by Gov. Spencer Cox in February 2022 and serves Salt Lake, Summit and Tooele counties, is set to retire effective Sept. 16, 2026. His roughly four-and-a-half-year tenure has drawn public attention primarily through the Emiliano matter stemming from a fatal stabbing on Aug. 17, 2023, at Scottsdale Park in West Valley City.
Then-14-year-old Emiliano said he stabbed 24-year-old Niusami Auelua in self-defense after Auelua, who was on fugitive status with Adult Probation and Parole and had high levels of methamphetamine in his system, robbed him at gunpoint, pointed a gun at his head, and fled. The Salt Lake County District Attorney’s Office initially declined to file charges, citing self-defense issues. Months later, Deputy District Attorney Adrianna Davis charged the teen with first-degree murder (later reduced via plea), obstruction of justice and possession of a dangerous weapon by a minor.
In February 2024, Emiliano pleaded guilty to manslaughter under a deal and was sentenced to secure care until age 25. In March 2025, after new counsel Nathan Evershed raised allegations of nondisclosure and an inappropriate personal relationship between Davis and West Valley City Police Detective Josue Llil (a key investigator), Third District Juvenile Court Judge David L. Johnson vacated the plea and conviction. Johnson described the proceeding as “extraordinarily unique” and “the first of its kind” he was aware of in Utah juvenile court, noting the substantial research and pleadings involved. He reinstated the original murder charges while keeping the case in juvenile court.
In a 15-page May 2025 order, Johnson then disqualified the entire Salt Lake County District Attorney’s Office—including District Attorney Sim Gill—from further involvement. He cited the office’s failure to disclose the relationship, withheld investigation results, discovery violations, and communications that could chill prosecutorial independence. Johnson wrote that the cumulative effect created an appearance of impropriety that undermined public confidence and the minor’s due process rights. He emphasized the unique equitable focus of juvenile court on the child’s best interests and rehabilitation rather than pure punishment. Disqualifying an entire prosecuting agency was described as unprecedented in Utah’s juvenile system. The Utah Attorney General’s Office was appointed as special prosecutor.
On Aug. 25, 2025, after the special prosecutor (Criminal Deputy Attorney General Stewart Young) agreed the evidence supported a strong self-defense claim that would be difficult to overcome by clear and convincing evidence, Johnson dismissed the petition with prejudice. He found continued prosecution not in the interests of justice or the minor’s welfare. “The Court finds that continued prosecution is not in the Interests of Justice or the welfare of the minor, so accordingly, this Court will dismiss this petition… with prejudice,” Johnson stated. The teen, by then 16 and working while starting college, was freed from further threat of prosecution.
Johnson’s pre-bench career informed his approach. He represented children for more than 14 years as a guardian ad litem and then delinquency defense attorney, earning the 2017 Excellence in Juvenile Representation award from Utah Juvenile Defender Attorneys. He later served as an assistant attorney general and general counsel for the Utah Department of Human Services. He has presented nationally on juvenile human trafficking and served on boards addressing trafficking and juvenile homelessness, though specific high-profile trafficking dockets from his judicial tenure are not publicly detailed due to the confidential nature of most juvenile proceedings.
Public court records and news coverage of other individual cases handled by Johnson remain limited, as Utah juvenile court matters prioritize privacy and are rarely appealed or reported by name. No major appellate decisions reversing or affirming high-profile Johnson rulings appear in readily available Utah Court of Appeals or Supreme Court records beyond the broader context of the Emiliano matter. His retirement has prompted the Third District Judicial Nominating Commission to advance nominees including Christine Henneman, Russell Minas, Carolyn Perkins, Julie Sagers and Lance Talakai for the vacancy.
Johnson’s handling of the Emiliano case stands as the clearest public window into his judicial philosophy: prioritizing due process, transparency, and the rehabilitative mission of juvenile court even when it required extraordinary remedies against a powerful prosecuting agency.
