A strand of hair once seen as a potential breakthrough in the Nancy Guthrie abduction case has led investigators nowhere. Pima County Sheriff Chris Nanos confirmed to ABC News on Thursday 30 July that forensic testing on hair recovered from the 84-year-old's Tucson-area home is complete and has failed to connect to any suspect.
Six months after Nancy Guthrie vanished from her home, the finding leaves a mixed DNA sample as the only known biological evidence in a case that has stretched the resources of the FBI and multiple private laboratories across the country. The setback deepens one of the most closely watched missing-persons investigations in recent memory, made more prominent by its connection to 'Today' show host Savannah Guthrie.