Authorities investigating the kidnapping of Nancy Guthrie are focusing on surveillance footage from two key dates leading up to her disappearance. Since Feb. 1, investigators from the Pima County Sheriff’s Department and the FBI have been canvassing the Tucson, Ariz., neighborhood where she was last seen. The requests for surveillance footage have not been new, with authorities previously reaching out to Ring doorbell camera users near Nancy's home for specific dates, including one 20 days prior to her kidnapping. The person responsible for the kidnapping has been described as a male, approximately 5’9” - 5'10” tall, wearing a black, 25-liter ‘Ozark Trail Hiker Pack’ backpack. The search for Nancy has entered its seventh week and no suspects or persons of interest have been identified.