The investigation into the disappearance of Nancy Guthrie is in its sixth week, and the FBI is now asking local residents about construction workers and a neighbor who moved out before the 84-year-old mother disappeared.

According to NewsNation’s senior investigative reporter Brian Entin on the latest episode of Brian Entin Investigates, the FBI has been back in the Catalina Foothills neighborhood where Nancy lived in Tucson, Arizona. Entin reports that agents have been “going back to neighbors’ houses and asking more questions.”

Originally published on tvinsider.com, part of the BLOX Digital Content Exchange.