The death of Kimberly A. Wuerthele, of Portage, was classified as a homicide, the Monroe County (Mich.) Sheriff's Department said in a statement. Her body was found March 31, 1982, in the Monroe area, about 35 miles southwest of Detroit near Toledo, Ohio. She was 21 and last seen Feb. 26, 1982.
An autopsy at the time wasn't able to determine cause of death.
An "active homicide investigation" is being conducted by the Monroe County Sheriff's Department, which said it didn't plan to immediately release additional information.
According to Portage police, Wuerthele's family reported her missing in June 1982, nearly four months after she drove to Chicago when her family tried to get her help for an addiction problem. She wasn't heard from again. The case went cold, but Portage police began investigating again in 2008.
In 2010, police learned of a DNA database of unidentified remains at the University of North Texas. They tracked down down two of Wuerthele's brothers and, using DNA from one of them, submitted information in December. A match was made this month with the body found in 1982.