An FBI expert believes the "walls are closing in" on Nancy Guthrie's kidnapper after her daughter, Savannah, returned to the TODAY Show anchor desk on Monday (April 6).

Former FBI agent Jason Pack told Page Six that Savannah's return to her "national platform" will keep attention on her mother's case.

“Every day that passes the pressure builds. Keeping a secret like this is exhausting. … and that gets harder with every morning that Savannah Guthrie sits behind that anchor desk,” Pack said.

“Most criminals in cases like this count on the media moving on,” he continued. “They count on the family fading from public view. They count on people forgetting. This case is different. Savannah has a national platform and she shows up on it every single day. Every time a viewer sees her face, they think about her mother.”

Pack said the "pressure on the people responsible" will increase as the case continues to receive more attention.

“Add a reward of more than one million dollars and the full weight of FBI resources and you have a situation where the walls are not just closing, but they are closing from every direction at once,” he said.

Savannah's TODAY Show return came hours before TMZ reported that it obtained a new ransom note claiming to know where Nancy Guthrie's body was. Two notes were sent by the same mystery person who had previously demanded one bitcoin in exchange for information regarding Guthrie after her February 1 disappearance.

“We got another letter today from this person, an email saying, ‘I know where her body is, and who the kidnapper is, give me half a bitcoin and I’ll tell you,'” TMZ founder Harvey Levin said on Monday, adding that one of the notes claimed "she is dead."

A second note came in to the gossip outlet claiming “I saw her alive with them in the state of Sonora Mexico.” TMZ confirmed that it had alerted the FBI about the two notes. The person vowed to surrender the information for half a bitcoin with another transferred to their wallet when a public arrest is made.

Levin claimed that the sender was "persistent" despite potentially being charged with a hoax by law enforcement, who had previously "disregarded" them "as a scam."

“It’s unbelievable that millions have been wasted and yet here I am willing to deliver them on a silver platter since the 11th of February for a bitcoin but I am disregarded as a scam … they are free and the case is frozen but the ego’s remain hot when it comes to me,” the first letter reportedly states.

There are no suspects identified in Nancy Guthrie's kidnapping, through the FBI had released doorbell camera footage of an armed and masked man outside her home on the morning she was reported missing. The bureau described the man in the footage as being 5 feet, 9 inches to 5 feet, 10 inches with an average build.

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