Nancy Guthrie's Survival Rate Only 10 Percent as Life Expectancy Drops When Moved to Second Location, Says Former Special Deputy U.S. Marshal

It's unlikely that Savannah Guthrie's missing mom, Nancy, is still alive, according to a former special deputy U.S. marshal.

Discussing the 84-year-old's disappearance on journalist Ashleigh Banfield's show "Drop Dead Serious" last Tuesday, February 17, Spencer Coursen explained that when you've been kidnapped, your "life expectancy drops about 90 percent when you are moved to a second location."

Spencer went on to tell viewers that due to the grim statistic, you should "fight like your life depends on it" if you ever think you're "about to be abducted."

"If an abduction is attempted at the first location, you have a 90 percent survival rate," he continued. "Once you get moved to a second location, that survival rate drops to 10 percent because now you have given the abductors control, you have given them time, and you have given them options."

Ashleigh told Spencer he reminded her of something that was "drilled into my head" during her training to be a war correspondent.

"'If you're put in a car, you're probably not coming out,'" she relayed. "So take the bullet. Run in a zigzag. Do whatever you can. It's your best chance at getting away, but never, ever let them get you into that car."

Nancy has been missing since February 1, and it's widely believed that she was taken from her home in the middle of the night.

Savannah, 54, acknowledged her mom "may already be gone" in a heartbreaking video shared to Instagram on Tuesday, February 24, but the star said she remains desperate for her "recovery."

"Every hour and minute and second, and every long night has been agony since then of worrying about her and fearing for her and aching for her and most of all just missing her," the NBC host said in the tearful message.

The television personality also revealed the family is offering a reward of up to $1 million for any information that leads to Nancy being found.

Meanwhile, genetic genealogist CeCe Moore told an outlet on Tuesday, February 24, that whoever left DNA evidence at Nancy's Arizona home "should be very concerned."

"If I was the kidnapper, I would be extremely worried right now, particularly if I knew there was some kind of altercation, or I knew I touched things in there," she said.

Speaking about the masked suspect captured on the retiree's doorbell camera in the wee hours of February 1, CeCe explained that while the intruder took precautions to avoid leaving DNA behind, it's possible he transferred saliva onto his gloves and then touched something.

However, Pima County Sheriff Chris Nanos told NBC News on Friday, February 20, that the DNA evidence is "mixed," meaning it contains genetic material from more than one person.

"We listen to our lab, and our lab tells us that there’s challenges with it,” he said, revealing it could take "weeks, months or maybe a year" to get results.