New evidence has emerged regarding the disappearance of Nancy Guthrie, 84, mother of NBC News star Savannah Guthrie. Authorities confirmed she vanished from her Tucson, Arizona home on Saturday night and remain without leads for nearly three days.

According to a Tuesday update from Pima County Sheriff Chris Nanos, Guthrie’s implanted pacemaker lost connection with her Apple devices around 2 a.m. Sunday—a critical detail that emerged during early investigations. Law enforcement sources stated that when officers arrived at her home hours later, both her phone and Apple Watch were still inside the residence.

Guthrie’s son-in-law, Tommaso Cioni, was last seen with her on Saturday evening after dropping her off at her Tucson home following a meal with his family. Nanos confirmed Cioni ensured she safely entered the house before leaving. Authorities report Nancy disappeared between 9:45 p.m. and Sunday morning, when friends noticed she had not attended church services.

The sheriff’s office noted that as of Wednesday, no suspects have been identified in connection with Guthrie’s disappearance. Investigators are focusing on forensic evidence including DNA analysis and video footage to advance the case. Nanos cautioned that ground and air searches would gradually slow as efforts shift toward deeper investigative work.

This story is a result of ongoing developments in the case involving Nancy Guthrie, whose whereabouts remain unknown.