After nearly a half-century of investigative work, forensic experts in Delaware have officially identified the human remains discovered in Brandywine Creek in 1975 as those of 20-year-old William “Billy” Arthur Jr., according to an announcement by the Delaware Department of Justice and the state’s Division of Forensic Science.
The 1975 Discovery in Brandywine Creek
The remains were originally recovered from Brandywine Creek on April 26, 1975. For decades, investigators attempted to determine the identity of the person using traditional forensic methods available at the time, but the case ultimately went cold as leads dried up and physical evidence yielded no matches in missing persons databases.
According to the Delaware Division of Forensic Science, the case remained an active priority for cold case units seeking to leverage emerging technologies. Investigators eventually exhumed the remains to extract DNA suitable for advanced genetic genealogy testing, a method that has increasingly helped law enforcement untangle decades-old mysteries across the United States.
Advanced Genetic Genealogy Leads to Identification
The breakthrough in the 49-year-old case came through a partnership between state officials and specialized forensic DNA laboratories. Forensic scientists utilized advanced genealogical DNA profiling, building family trees from genetic profiles uploaded to public databases to narrow down potential descendant pools.
State officials confirmed that genealogical matches pointed directly toward the Arthur family. Subsequent direct DNA reference samples provided by family members confirmed the identity of the remains as William Arthur Jr., who had been 20 years old at the time of his disappearance in the mid-1970s.
Next Steps for Investigators
With the identity of William Arthur Jr. now officially established, the Delaware Department of Justice and local law enforcement agencies are shifting focus toward investigating the circumstances surrounding his death in 1975.
Authorities urge anyone with historical information regarding William Arthur Jr. during the period leading up to April 1975 to contact the Delaware State Police or the Delaware Department of Justice cold case unit. Officials continue to review archival records from the initial 1975 recovery to reexamine evidence in light of the new identification.
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