Law authorities say they used investigative genetic geology to solve the 1976 rape and murder of a 19-year-old nursing student. Investigators said the technology helped identify the man who attacked Janet Stallcup at Christmastime that year while she was on her way to a party. Her body found eight days later inside her car, about two- and-a-half miles from her Garden Grove apartment. Her alleged killer, who police identified as Terry Dean Hawkins, died in 1977 while inside an Orange County jail for an unrelated reason. He was 45. Despite the case going cold for decades, the Orange County crime lab obtained a single source male DNA profile in 2002 from swabs taken from the crime scene, the Orange County District Attorney’s (OCDA) office said. The profile did not find a match in the Combined DNA Index System database. The Garden Grove Police Department then asked the OCDA’s Office in 2020 to open …