A major new lead in the Nancy Guthrie case centers on a vacant house near her Tucson home, where federal agents are searching for clues tied to her disappearance. Investigators are examining witness reports, suspicious tenant movements, possible surveillance activity, and forensic evidence as they narrow in on how the suspect may have planned the crime. With DNA testing, digital tracking, and neighborhood tips all playing a key role, this case appears to be entering a critical stage. #NancyGuthrie #MissingPerson #TrueCrime #BreakingNews