'This is the only contact': Explosive details emerge in alleged Nancy Guthrie ransom note

New details emerged Thursday about an alleged ransom letter obtained by TMZ in the abduction of Nancy Guthrie, the 84-year-old mother of "Today" show co-host Savannah Guthrie.

Nancy Guthrie was abducted from her Tucson, Arizona, home in the Catalina Foothills around 1:45 a.m. on Feb.1. She dined with family via Uber before returning home by 9:50 p.m. Her doorbell camera disconnected early Sunday, followed by her pacemaker app around 2:30 a.m.

The family discovered her missing after church around noon and called 911.

Blood confirmed as hers via DNA trailed near the entrance.

On Thursday, Harvey Levin of TMZ joined Erin Burnett on her CNN show, "OutFront" to discuss the case. After Burnett played a clip of Guthrie's son asking the kidnapper for proof their mother is still alive, Levin gave more insight into the ransom note sent to TMZ and other local Arizona outlets.

"They are pleading for this person to come forward if it indeed is the person behind this letter," said Levin.

He then revealed crucial new details about what's in the letter itself that likely led to the Guthrie family's plea.

"The letter says 'you will have no way of contacting me,'" he said. "'This is the only contact.' So that's why they're pleading for proof of life. That's why they are begging, because they have no idea how to get in touch with this person."

Levin noted that the sender of the ransom note, which demands millions in Bitcoin, went to "great lengths" to make sure it "stays anonymous."

"I don't know that the FBI is at all close to figuring out where it came from. My guess is they haven't based on what our IT team has done here," he said. "So I don't think they know who sent it. And the person who sent it says, 'this is going to be the only contact.' and 'you have no way of getting in touch with me.'"

The letter, he added, specified that Guthrie is "OK, but scared," and "aware" of the ransom demand.