It's been nearly three weeks since Nancy Guthrie vanished from her secluded Tucson, Arizona, home in the dead of night, and investigators say they are no closer to identifying a leading theory or motive behind her abduction.
The saga has become a waking nightmare for Guthrie's family, with her daughter, "Today" show host Savannah Guthrie, posting a series of increasingly heartbreaking pleas on social media for her mother's abductors to "do the right thing" and bring Guthrie home.
A private donor is backing anew $100,000 rewardfor information leading to the arrest of Guthrie's captors. Meanwhile, the Pima County Sheriff's Department and the FBI have increased their rewardto $100,000.
Investigators are facing mounting pressure to piece together the fragmented puzzle of evidence they've gathered. From chilling surveillance footage and alleged ransom notes to DNA and a collection of gloves, here's a look at what we know about the evidence in the investigation:
The surveillance footage
In perhaps the biggest break in the case so far, investigators on February 10 released surveillance footage and images recovered from Guthrie's doorbell camera.
The Nest camera was reported missing after Guthrie's abduction, but investigators partnered with Google, which owns the camera company, to recover some of the data.
The grainy video shows a man in a ski mask approaching Guthrie's front door and attempting to cover her doorbell camera with a gloved hand. He then walks off the porch and picks up shrubbery to try to cover the lens.
The FBIlater describedthe person as the "suspect in the kidnapping of Nancy Guthrie." The agency said the man is approximately 5-foot-9 to 5-foot-10 tall with an average build.
"We hope this updated description will help concentrate the public tips we are receiving," the FBI Phoenix office said.
The suspect appears to be wearing a backpack and a gun holster in the surveillance footage, but in one of the photos released by the FBI, both items are missing.
This photo was taken on a separate day, a source told CNN, and investigators now believe the suspect may have visited Guthrie's home on multiple occasions.
"This might help explain why investigators appear to be so focused on the weeks before her abduction,"CNN's Ed Lavandera said. "And this also kind of gets to the question about whether or not this was just a random act."
In an interview with the "Today" show on February 24, Pima County Sheriff Chris Nanos said the images recovered from the doorbell camera did not include dates or timestamps and any conclusions about when the photos were taken are "speculative."
Savannah Guthrieshared the footageof the suspect on her social media accounts with the caption, "someone out there recognizes this person."
"We believe she is still out there," she writes, "Bring her home."
The backpack
In the footage and images released by the FBI, the suspect appears to have a gun holstered near the center of his waist –an unusual position– and is seen wearing a backpack with reflective straps.
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The FBI later said the backpack he is wearing is a black, 25-literOzark Trail Hiker Pack.
The Pima County Sheriff's Department told CNN the backpack is only sold at Walmart, and investigators are working with the retailer to gather more information.
The glove
As they searched the area around Guthrie's home, investigators recoveredmultiple gloves.
But a glove found about two miles from the house appeared to visually match the ones worn by the suspect, according to the FBI. Authorities took DNA samples from the glove and ran it through the national database known as CODIS, which compares a DNA sample against the profiles of more than 19 million known offenders.
But it did not return any matches.
Authorities have not determined if the glove is connected to the kidnapping.
The DNA
Investigators say they have also recovered DNA from Guthrie's property that doesn't match the 84-year-old or anyone close to her. Although they have not disclosed where the DNA was recovered, they've said they're still working to find a match.
After the DNA on the glove failed to return a match in CODIS, investigators will likely turn to the growing field of genetic genealogy – which has led to breakthroughs in several high-profile cases, including Bryan Kohberger and the Gilgo Beach murders.
Genetic genealogy capitalizes on the popularity of consumer DNA products to compare a forensic DNA sample against the profiles in the databases of private companies, like Ancestry. Even if the suspect has never personally used an at-home DNA service, a family member may have, and this can unlock clues to their identity.
The ransom notes
Throughout the investigation, multiple media outlets have received purported ransom notes from people claiming to be Guthrie's captor. While authorities have not said whether the ransom notes are authentic, investigators have said they are taking them seriously.
Days after Guthrie went missing, TMZ was among the first to report on an initial note demanding millions of dollars in Bitcoin for her safe return. According to the outlet's founder,Harvey Levin, the note began by saying Guthrie was "OK, but scared."
Levin said the letter included one detail that has not been reported: the placement of Nancy Guthrie's Apple Watch. The note also included two deadlines. The same letter was also sent to local CNN affiliates KOLD and KGUN.
KOLD later reported asecond notehad been sent to its tip email and shared with investigators.
A manhas also been chargedwith sending a fake ransom threat in connection with the case. The FBI said he was "trying to profit" from the case and there was "no evidence to connect" him to her disappearance.
CNN's Elizabeth Hartfield and Ed Lavandera contributed to this report.
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