THIS CHANGES EVERYTHING — SAVANNAH GUTHRIE’S MOTHER’S PACEMAKER SUDDENLY WENT DARK AS POLICE CALL EMERGENCY PRESS CONFERENCE The search for Savannah Guthrie’s missing mother has taken its most alarming turn yet. Investigators have confirmed her pacemaker abruptly stopped syncing with her Apple Watch — a chilling development that has sent shockwaves through the case and sharply narrowed the timeline. Moments later, police announced a surprise press conference, fueling fears that authorities are preparing to reveal information the family — and the public — may not be ready to hear. What was once a hopeful search is now racing against silence, and the next update could change everything.

Nancy Guthrie’s pacemaker reportedly stopped syncing with her Apple devices before dawn Sunday — as the Arizona sheriff leading the missing person case called a surprise press conference for late Tuesday morning.

The implanted medical device lost contact with NBC News star Savannah Guthrie’s mom’s Apple products around 2 a.m., a law enforcement source told Fox News.

When authorities reached her Arizona home hours later, Nancy’s phone and Apple Watch were still inside the house, the source said.

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The disturbing revelations come as the Pima County Sheriff’s Office is expected to address reporters around 11:30 a.m. local time to provide an update after previously telling The Post just hours earlier there were no media appearances planned for Tuesday.

Nancy was reported missing in what law enforcement believe is a possible “kidnapping or abduction.”

Sources told The Post blood and signs of forced entry were found inside her house in the aftermath of the disappearance.

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Savannah, the co-host of “Today” has asked fans for their prayers as the family holds out hope.