India, July 31 -- DNA analysis of hair collected from Nancy Guthrie's residence has not brought investigators any closer to identifying a suspect in her disappearance, according to Pima County Sheriff Chris Nanos.

The Sheriff informed ABC News regarding the disappointing forensic progress in the case concerning Savannah Guthrie's 84-year-old mother, who has been unaccounted for since early February. "The hair was done... and there was nothing," he stated.

The FBI's Phoenix office corroborated the information in a statement to NBC News, saying that "all hair had been resolved and it does not point to a suspect" in the ongoing probe. They chose not to provide additional comments.

Nanos remarked that discovering DNA on hair is "extremely ...