MIAMI — Brian Entin has been locked in since Day One.

Mere hours after “Today” show anchor Savannah Guthrie’s mother was reported missing in Tucson, Arizona, the NewsNation correspondent was on a flight out of Miami.

The 41-year-old reporter has been on the ground every day since, chasing leads, interviewing authorities, reaching out to sources and providing constant updates to his thousands of followers in real time.

Guthrie was reported missing on Feb. 1, after not showing up to church. According to the Pima County Sheriff’s Office, blood was found on her doorstep, the surveillance camera removed.

Initially, Entin assumed the retiree had walked out on her own and gotten lost, but that theory didn’t hold for long.

“I thought maybe it was a Silver Alert like we have for seniors in Florida,” the Fort Lauderdale native told the Miami Herald. “We all soon realized it was a crime scene; she has no cognitive issues.”

First order of business was camping out at Guthrie’s home, about 20 minutes outside downtown Tucson. What struck Entin immediately was how different Arizona is from Florida. From the arid desert weather to the cacti- and arroyo- pocked terrain.

“It’s so hot and dry during the day, you have to keep applying Chapstick and sunblock,” Entin reports, adding that no streetlights are allowed due to an ordinance for stargazers. “The nights are pitch black and ... the coyotes come out. You hear big packs of them, howling. When the sirens blare, they respond, and you realize how close they are.”

The layout of Guthrie’s upscale Catalina Hills neighborhood is spread out, with houses on lots of 3 to 4 acres. Entin says the area is reminiscent of Homestead or Southwest Ranches.

“It’s very nice, not someplace where you would expect something like this would happen,” he says. “That’s why nothing made sense. Who would kidnap an 84-year-old grandmother in the middle of the night from here? How could she just vanish?”

Of all the multiple tips and leads, including cryptic ransom notes and dozens of people of interest being detained and released, the case is still mired in mystery.

“I still literally have no idea; there’s been so many twists and turns,” says Entin, who spent weeks in Idaho covering the Brian Kohberger murders last year. “One day, I’ll think, ‘This is it,’ and your adrenaline is so high and you’re feeling just relief that her family will have some answers and Nancy may be alive. Then it’s another dead end.”

Entin does his part to help. He spends his days waiting for updates from the feds and local cops, connecting with law enforcement insiders and talking to folks in the community. He also spends a lot of time on X, scrolling the comments from internet sleuths who watch his every move. Many fans see him as the go-to guy who manages to scoop TMZ time and time again. Under his posts invariably are folks thanking Entin for his dedication, tirelessness, with one even appreciating his “soothing” voice.

“Some [social media users] really have some good ideas and notice something I didn’t,” says the former WSVN-7 News reporter who has gained roughly about 100,000 followers since this whole thing began. “I’m trying to stay on top of this as much as I can. Obviously, I haven’t been sleeping much, but I am all in.”

So far, the biggest break has been the FBI tracking down footage from Guthrie’s Nest camera revealing an armed, masked man on her porch removing the doorbell cam. Since then, numerous gloves have been found scattered near the main drag as well as a knapsack sold at Walmart. All items are being thoroughly investigated, say police.

The latest development sounds promising: Tracking the genealogy of DNA recently discovered at Guthrie’s house. Entin notes this is how convicted killer Kohberger was eventually caught after leaving a knife sheath behind at the home of four slaughtered University of Idaho students.

But genetic testing is a tedious and slow as potential evidence is being sent to private, family owned DNA Labs International in Deerfield Beach, more than 2,000 miles away. Pima County sheriff Chris Nanos admitted to NBC News that the transporting and processing of such sensitive material is “challenging” and could take “years.”

On Tuesday, Savannah Guthrie seemed at the end of her rope, releasing a fresh plea on Instagram; the post reveals the family’s reward has been upped to $1 million (the FBI’s reward stands at $50,000).

“Coming on to say it is day 24 since our mom was taken in the dark of night from her bed, and every hour and minute and second and every long night has been agony since then, of worrying about her and fearing for her, aching for her, and most of all, just missing her, missing her,” said the 53-year-old TV star. “We know that millions of you have been praying. So many people have been praying of every faith and no faith at all, praying for her return, and we feel those prayers. Please keep praying without ceasing. We still believe. We still believe in a miracle.”

For Entin, the Guthrie disappearance hits home, and he has no exit plan.

“I can’t help but think of my mom and this happening to her. So many of us have older parents, and you worry about them,” he says. “I still feel like anything could happen at any moment and feel so invested. We’ve just been working so hard every day, all day, and most of the night, that it doesn’t feel right to just pack up and leave. I just want to see this through.”

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If you have information about Nancy Guthrie, call 1-800-CALL-FBI (1-800-225-5324). You can remain anonymous.

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