Investigators say they have been unable to determine the cause of death of a missing Colorado mom whose skeletal remains were found in Delta County. DNA test results have confirmed that the remains found in western Colorado in early March are that of Grand Junction resident Paige Birgfeld, who disappeared in 2007. However, a forensic anthropologist told investigators that no cause of death could be determined. The 34-year-old mother of three sold kitchen products, did odd jobs and ran an escort service. Hikers found the skeletal remains in a dry creek bed near the Mesa-Delta county line. Authorities say it appears Birgfeld's body was buried, but erosion eventually exposed it. There is no readily identifiable cause of death in the investigation, Mesa County Sheriffs Department Sgt. Matt Lewis told the Grand Junction Daily Sentinel. The findings were in a report done by Colorado State University forensic anthropologist Dr. Diane France, the newspaper reported. France examined the bones on March 22 in Fort Collins. She is the director of CSUs laboratory for human identification.