A heartbroken Savannah Guthrie shared an emotional post for her missing mom Nancy on Mother's Day.
Sharing a video compilation of her and her mother to Instagram, Savannah said: 'Mother, daughter, sister, Nonie.
'We miss you with every breath. We will never stop looking for you. We will never be at peace until we find you.'
She also urged her followers to contact the FBI if they knew anything relating to her mother's disappearance.
Sunday marked Savannah's first Mother's Day without Nancy, who went missing on February 1 from her home in Tucson, Arizona.
Her whereabouts remain unknown, and she was last seen by family members the night before, on January 31, after joining them for a game night.
Nancy, 84, is believed to have been kidnapped by unknown captors nearly 100 days ago, investigators believe.
Some evidence has come to light since the case first broke open, but none of it has led to an arrest.
Nancy is believed to have been kidnapped by unknown captors nearly 100 days ago
Alongside her emotional post, Savannah also urged anyone with information relating to her mother's disappearance to approach law enforcement
The latest batch of evidence to come forward was in early April after FBI agents discovered 'potentially critical' new DNA at Nancy's home.
Agents sent the sample to a private Florida lab, sources told ABC News. NewsNation reported that pieces of hair were found inside the property.
They will use the latest technology to analyze the results and see if it flags a possible suspect for the abduction.
The Pima County Sheriff's Department previously said that DNA recovered from Nancy's home was a sample that came from more than one person.
Sources told the outlet that Pima County Sheriff Chris Nanos recently revealed to a neighborhood watch group that it could take six more months to identify the sample.
Nanos said that five other labs around the US are working on Nancy's case, but the names of facilities, what their roles are, and if there are additional DNA samples that are relevant to the case remain unclear, per the outlet.
The ongoing investigation into Nancy's puzzling disappearance is being directed by about two dozen Pima County and FBI investigators.
So far, they have looked at a series of blackmail messages sent to the Guthrie family and to media outlets demanding money in bitcoin in return for Nancy.
She was last seen entering her $1 million home, seen here, on the evening of January 31 after having dinner with her daughter, Annie, and son-in-law, Tommaso Cioni
The FBI previously released images of a potential suspect at Nancy's door on the night she vanished, seen here
No ransoms were ever paid, as the Guthrie family demanded proof of life but never received it.
Authorities and the family also could not verify the authenticity of the ransom notes, despite their willingness to pay.
Over the course of the investigation, only a few people have been taken in for questioning. No one has been arrested.
Various pieces of evidence have also been found at the home and in the surrounding area, including drops of blood on Nancy's front porch, a torn-down doorbell camera, and various gloves.
Surveillance footage also captured a masked person outside her front door. The footage has so far been the only major evidence breakthrough made public.
Dave Smith, a former lieutenant with the Arizona Department of Public Safety, recently told Fox News that he believed Nancy might have been taken to Mexico.
'My first thought is always Mexico in a major crime, because it's a great haven, and it's hard for us to follow up on,' Smith told the outlet.
The Guthrie family has offered a $1 million reward for information leading to the recovery of their mother
Smith noted that Tucson is located about 60 miles from the border, making that scenario a 'strong possibility.'
Smith also noted that the masked suspect seen on surveillance footage recovered from Guthrie's Nest doorbell camera appeared to be carrying a holstered pistol in what he described as 'Mexican carry' style.
The retired law enforcement officials also noted that the rugged terrain surrounding Tucson has complicated the search.
'The whole Tucson Valley is literally built around these arroyos, these ephemeral rivers,' he said. 'It's like a giant alley through the neighborhoods.'
He said the desert offers countless hiding places while also quickly destroying evidence.
'The evidence is transitory,' Smith said. 'Once it rains, your footprints go away, the sun is hard on other forms of evidence and frankly this is a tough place to investigate crimes.'
He suggested tensions between local investigators and the FBI may be tied to concerns that evidence pointing to Mexico would have made the case a federal investigation.
Sheriff Chris Nanos and FBI Director Kash Patel have publicly disagreed over how quickly federal authorities were brought into the case.
Patel previously discussed Nancy's case on Sean Hannity's podcast, defending the FBI.
He said that while Guthrie's case was a state matter, they were being kept out altogether by the Pima County Sheriff's Department.
'For four days we were kept out of the investigation,' he said, adding that this was especially damaging because 'the first 48 hours of anyone's disappearance are the most critical.
The Guthrie family has offered a $1 million reward for information leading to the recovery of their mother.
Savannah previously said that she realizes Nancy may no longer be alive - but that if that is the case, she is still desperate for the return of her mother so she can give her a Christian burial.