For almost thirty years, authorities were baffled by the mystery surrounding a man’s remains discovered inside a sleeping bag in a secluded region of Washington. The case has finally been cracked, thanks to breakthroughs in DNA technology.
On June 10, the National Park Service revealed that the skeletal remains belong to Joseph Louis Serrao Jr., a man whose family last had contact with him in 1998. This identification closes a long-standing cold case that has puzzled investigators for decades.
The story began in July 2000 when a researcher stumbled upon the remains in a sleeping bag within the Sol Duc River area of Olympic National Park, known for its remote hiking trails and rugged terrain.
Upon examination, a pathologist from the King County Medical Examiner’s Office concluded that the remains were those of a man between 30 and 50 years old, and his death likely occurred between six months and four years prior to the discovery.
Despite thorough investigations and analysis of the items found at the scene by the Washington State Patrol Crime Laboratory, the absence of usable fingerprints left the identity of the deceased unknown—until now.
No one knew exactly who the man was or what happened to him.
A breakthrough came in 2024 when a forensic anthropologist submitted a DNA sample from the remains to Othram, a company that specializes in forensic genealogy. By 2025, the testing had identified possible family members.
Relatives from several states participated in interviews and submitted their own DNA, helping to confirm Serrao’s identity. According to family members, Serrao was originally from Hawaii and had been in Washington before he went missing.
Officials have not publicly revealed Serrao’s cause or manner of death.
“Investigators never lost sight of the goal of identifying this individual and finding answers for his family,” Debra Flowers, deputy chief of the National Park Service Investigative Services Branch, said in the press release.
“I’m proud of the persistence and collaboration that made this identification possible,” Flowers added. “And I hope it brings some measure of closure to those who have spent so many years wondering what happened to Joseph.”