The Federal Bureau of Investigation has released footage of a masked, 'armed' individual seen appearing to tamper with Nancy Guthrie's doorbell cam on the morning she disappeared.
The family of the 84-year-old - the mother of broadcaster Savannah Guthrie - reported her missing on Sunday 1 February.
Nancy had last been seen the evening prior, at around 9.45pm on 31 January, at her home just outside of Tucson, Arizona.
Her children - including 54-year-old TV presenter Savannah, her sister Annie and brother Camron - had been notified by Nancy's friends that she did not join them to watch virtual church services on Sunday morning like she usually did.
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Based on initial evidence at the scene, authorities told press they believe Nancy had been taken against her will.
A ransom note had been submitted by the alleged kidnappers to several news outlets, demanding millions of dollars in Bitcoin in exchange for her release.
The 9 February deadline laid out on the note - which the FBI previously claimed they're working on to suss out its authenticity - has since passed.
On Monday (9 Feb), police added that they're yet to identify any suspects or vehicles they believe to be behind the gripping case.
In the latest bid to see Nancy returned to her family, however, the FBI last night (10 Feb) released both images and two harrowing videos of someone appearing to tamper with Guthrie's doorbell cam who could be a potential suspect.
One of the clips features an individual who is said to have been armed.
Both show the individual approaching the front door to the property, checking a camera pointing towards the porch, before moving away. He then picks up a bunch of vegetation from the front garden and smears it on the camera, covering the lens.
Whilst sharing the latest media files, officials also told press they believe Nancy is still alive, and implored anyone with new information on her whereabouts to get in touch.
FBI Director Kash Patel said in a statement on X: "As of this morning, law enforcement has uncovered these previously inaccessible new images showing an armed individual appearing to have tampered with the camera at Nancy Guthrie's front door the morning of her disappearance."
Patel - whose team are offering a $50,000 (£36,000) reward for information - added the FBI had been working on recovering images from the pensioner's home surveillance system that 'may have been lost, corrupted, or inaccessible due to a variety of factors'.
He added that this includes 'the removal of recording devices'.
Sharing the newly-released footage online, Savannah wrote: "Someone out there recognises this person. We believe she is still out there.
"Bring her home."
She added in the caption: "We believe our mum is still out there. We need your help."
TODAY show host Savannah and her siblings previously issued a statement, emphasising that their mother is currently without vital medication.
"She’s 84 years old. Her health, her heart, is fragile," the Australian-American broadcaster begged. "She lives in constant pain.
"She is without any medicine. She needs it to survive, and she needs it not to suffer."
Savannah previously added of the alleged note: "We, too, have heard the reports about a ransom letter in the media. As a family, we are doing everything that we can. We are ready to talk.
"However, we live in a world where voices and images are easily manipulated. We need to know without a doubt that she is alive and that you have her. We want to hear from you and we are ready to listen."
In the same initial clip, Annie Guthrie added: "The light is missing from our lives. Nancy is our mother, we are her children, she is our beacon. We are always going to be merely human, just normal human people who need our mom.
"Mama, mama, if you’re listening, we need you to come home. We miss you."
Rhianna Benson