DNA technology leads to murder charge in 33-year-old Utah homicide

March 15, 2026 - 07:57

A breakthrough in DNA analysis has led to an arrest in a Utah homicide case that remained unsolved for 33 years. James Wallace Petersen III, 63, of Cedar City, was formally charged this month with murder and aggravated sexual assault, both first-degree felonies, in connection with the 1991 death.

The charges, initially sealed by the court, were made public following Petersen's arrest. The case had long been considered cold, with investigative leads exhausted years ago. However, recent advancements in forensic genetic technology provided detectives with new evidence directly linking Petersen to the crime scene.

Authorities have not yet released specific details regarding the victim or the circumstances of the homicide, citing the ongoing nature of the legal proceedings. The arrest marks a significant development in one of Salt Lake City's oldest active homicide investigations, demonstrating how modern forensic science can provide answers to families and communities after decades. Petersen is currently being held without bail as the case moves forward through the judicial system.