India, May 18 -- The investigation into the disappearance of Nancy Guthrie has taken another important turn after Pima County Sheriff Chris Nanos revealed that forensic experts are getting closer to identifying whose blood was found at the missing woman's property.

Speaking to People magazine, Nanos said investigators working on DNA testing have made progress and could soon identify the unknown blood evidence connected to the case. "I know we have DNA that is unknown, who the contributor or depositor is, but I think they're getting closer to finding out who that was," he said.

Nancy Guthrie Investigation Not a 'Cold Case,' Says Sheriff Chris Nanos

Sheriff Nanos also dismissed growing claims that the Nancy Guthrie disappearance investig...