India, Feb. 24 -- The Pima County Sheriff's Department has spoken out after sources familiar with the Nancy Guthrie investigation told ABC News that the masked man who was seen in surveillance photos and videos appears to have been at the 84-year-old's front door earlier than February 1, the night cops believe she was abducted. The sources added that one of the images released by the FBI, showing the person at Nancy's front door without a backpack, was captured by her Nest doorbell camera on a day before her suspected kidnapping.

The sources said that according to one of the theories, the suspect approached the door the first time, and was scared off when he noticed the camera. However, he returned later, which is when he is seen tamperi...