Investigators use Bluetooth detector to search for Nancy Guthrie

Arizona investigators have taken a high-tech tack in the search for Nancy Guthrie, flying over the Tucson desert with a Bluetooth signal detector in hopes of picking up a signal from her pacemaker. The device, also called a signal sniffer, aims to detect a heartbeat after Guthrie’s pacemaker disconnected from the app on her phone just before 2 a.m.

on Feb. 1; her Nest Cam also disconnected around that time. Nancy, 84, the mother of "Today" show co-host Savannah Guthrie, was first reported missing from her home on Feb. 1 after she failed to turn up for church services that Sunday. Her residence was declared a crime scene and investigators found a trail of blood outside the house.

The FBI released photos and video of a masked person approaching the home in the early morning hours of Feb. 1 and described a suspect as a male approximately 5-foot-9 or 5-foot-10 with a medium build. The intruder tampered with a home security camera, wore a weapon on their waistband and carried a bulging backpack.

United States, Tucson, Arizona

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