A young woman whose body was found in Anaheim 31 years ago was identified this week with the help of volunteers using the same technique that identified the suspected Golden State Killer. After many failed attempts, experts on Tuesday matched the DNA of a body found in 1987 with that of Tracey Coreen Hobson, who lived in the area at the time, by uploading the biological data into a website called GEDmatch.com, said Colleen Fitzpatrick, co-executive director of the volunteer-run nonprofit DNA Doe Project.