Six months after Nancy Guthrie was last seen alive, "Today" show cohost Savannah Guthrie and her family have vowed to continue searching for the 84-year-old despite months of "agony" over the unresolved kidnapping case."We are in a nightmare that will not end; nothing about our situation has changed," Savannah Guthrie said in an Instagram video released July 27, just days before the six-month anniversary of her mother being reported as missing.As in past videos, Savannah Guthrie's message appeared to address a possible kidnapper as she pleaded, "Help us find her. Tell us where to look for her. I truly believe it is never too late to do the right thing. Help us bring this situation to an end."Officials' most recent update on the case's progress came July 28, when Pima County Sheriff Chris Nanos said investigators "have so much DNA to sort through. We have so much in terms of video evidence to look at."The investigation has produced various DNA evidence − from Nancy Guthrie's dried blood droplets on the tile at the entrance to her home to specimens found inside her home that do not belong to her or her inner circle − but updates on any findings from the latter have not been shared publicly. A suspect seen in home surveillance footage is described as a man, "approximately 5'9"-5'10" tall, with an average build," who was "wearing a black, 25-liter 'Ozark Trail Hiker Pack' backpack."A reward totaling more than $1.2 million has been offered for information leading to Nancy Guthrie's recovery. Anyone with information about the case is encouraged to contact 1-800-CALL-FBI or tips.fbi.gov, the Pima County Sheriff's Department (520-351-4900) or 88-CRIME.Here's what we know about the day Nancy Guthrie went missing and updates in her case since.Jan. 31 to Feb. 1: Nancy Guthrie is last seen aliveThe evening of Saturday, Jan. 31, Nancy Guthrie left her home in the Catalina Foothills near Tucson, Arizona, and returned hours later, remaining alone overnight.The following is a timeline Nanos provided in a Feb. 5 press conference.Jan. 31 at 5:32 p.m. Guthrie left her house for a game night.Jan. 31 at 9:48 p.m. Her family dropped her back at home, and the garage door opened.Jan. 31 at 9:50 p.m. The garage door closed.Feb. 1 at 1:47 a.m. A doorbell camera in front of Guthrie's home disconnected.Feb. 1 at 2:12 a.m. Software for the smart home detected a person on the camera.Feb. 1 at 2:28 a.m. Guthrie's pacemaker app shows it was disconnected from her phone.Feb. 1: Nancy Guthrie's family calls 911 to report her missingIt was at her church that a fellow churchgoer called Nancy Guthrie's family Sunday, Feb. 1, after she failed to come over to watch a church service online.Feb. 1 at 11:56 a.m. Family members check on her.Feb. 1 at 12:03 p.m. Family calls 911 to report her missing.Feb. 1 at 12:15 p.m. Patrol cars arrive.Later in the evening, after sundown, Nanos spoke with reporters in a news conference and said a search and rescue team embarked on a search for Nancy Guthrie. "Ms. Guthrie is 84 years old and is not of good physical health, so naturally we have some great concerns. The scene at the house also [raises] some concerns for us as well," he added.Feb. 2: Nancy Guthrie's disappearance determined to be a crimeNanos held another news briefing and confirmed, "We believe now, after we processed that crime scene, that we do, in fact, have a crime scene, that we do, in fact, have a crime."The sheriff told "NBC Nightly News" that Nancy Guthrie "was taken out of the home against her will." A Pima County Sheriff's Department spokesperson confirmed her disappearance was being investigated as a "possible kidnapping or abduction."Feb. 3: First Nancy Guthrie ransom notes are confirmedNanos told CBS News that a local news affiliate, later confirmed to be KOLD News 13, received a letter on Feb. 2 that "contained specific details about the home and what Nancy Guthrie was wearing that night." Nanos said he shared the note with Savannah Guthrie.On Feb. 3, TMZ reported it also received an alleged letter demanding money in exchange for Nancy Guthrie's release.Throughout the case, law enforcement has not confirmed the validity of any ransom notes, though one ransom demand deemed an impostor later led to a man's arrest and guilty plea. "Some have been deemed to be extortion attempts without legitimacy. Other ransom demands may potentially be legitimate and are still being investigated as such," the FBI's Phoenix Field Office shared on X on July 1.Feb. 3: Donald Trump's comments on Nancy Guthrie's disappearanceDuring a bill-signing ceremony in the Oval Office on Feb. 3, President Donald Trump said he planned to speak with Savannah Guthrie."I'm going to call her later on. I think it's a terrible thing," Trump told reporters. "I always got along very good with Savannah," he added, calling it a "very unusual situation" and saying, "We're going to find out."A day later, Trump said on Truth Social that he had spoken with Guthrie and was directing "ALL Federal Law Enforcement" to assist her family and local authorities."I am directing ALL Federal Law Enforcement to be at the family's, and Local Law Enforcement's, complete disposal, IMMEDIATELY," he wrote. "We are deploying all resources to get her mother home safely."Feb. 4: Guthrie family acknowledges ransom note reportsSavannah Guthrie and her siblings posted an Instagram video speaking directly to their mother's potential abductor. The post was captioned, "Bring her home.""We too have heard the reports about a ransom letter in the media. … We are ready to talk. However, we live in a world where voices and images are easily manipulated," she said. "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. Please, reach out to us."Savannah Guthrie pleads after ransom note claims mother's death"Today" show anchor Savannah Guthrie makes an emotional on-air plea after a reported ransom note claims her mother has died.Feb 5: Guthrie family asks kidnapper to send them proofIn a Feb. 5 news conference, FBI Special Agent in Charge Heith Janke spoke on behalf of federal investigators for the first time. He said that the note, which investigators reviewed, did not provide "proof of life" and included "facts associated with a deadline," an Apple Watch, a floodlight and "a monetary value."Savannah Guthrie's brother, Camron Guthrie, spoke toward the person who might be "holding our mother" in an Instagram video posted on Feb. 5, the day of the first deadline allegedly mentioned in the initial ransom letter."We want to hear from you," Camron Guthrie said. "We haven't heard anything directly. We need you to reach out and we need a way to communicate with you so we can move forward. But first we have to know you have our mom."Feb. 5: FBI issues $50,000 reward for Nancy Guthrie's recoveryThe FBI blasted a missing person alert for Nancy Guthrie across its social channels, describing the woman as "a vulnerable adult who has difficulty walking, has a pacemaker, and needs daily medication for a heart condition.""The FBI is offering a reward of up to $50,000 for information leading to the recovery of Nancy Guthrie and/or the arrest and conviction of anyone involved in her disappearance," the agency announced.Feb. 6: Second ransom note claims Nancy Guthrie diedA second ransom email was sent out on Feb. 6, which KOLD confirmed on social media it received. The FBI and the Pima County Sheriff's Department also confirmed they were investigating a "new message," according to a post on X at the time.Months later, several outlets reported this note indicated Nancy Guthrie was dead.Feb. 7: Savannah Guthrie pleads with the potential abductor – 'We will pay'Savannah Guthrie and her siblings shared another video on social media addressing the potential abductor and the ransom notes on Feb. 7 but did not provide any details about demands being made of them."We received your message and we understand," Savannah Guthrie said. "We beg you now to return our mother to us so that we can celebrate with her. This is the only way we will have peace. This is very valuable to us, and we will pay."Feb. 10: FBI releases footage of possible suspect at Nancy Guthrie's doorFBI Director Kash Patel on Feb. 10 released four black-and-white images on X showing an armed individual appearing to tamper with the camera at Nancy Guthrie's front door the morning she disappeared. In two videos, the man – whose head is covered with a ski mask with cutouts for eyes and a mouth – appears to use his gloved hand to fiddle with the Google Nest camera. He seems to have a flashlight in his mouth and is wearing a backpack.He turns away, picks up a small piece of greenery from a nearby plant bed and turns back toward the camera before using the branch to cover the lens.Feb. 12: FBI doubles reward to $100KOnce the public was equipped with more information about the suspect, the FBI increased the incentive for people to come forward with tips."Today, the FBI is increasing its reward up to $100,000 for information leading to the location of Nancy Guthrie and/or the arrest and conviction of anyone involved in her disappearance New identifying details about the suspect in the kidnapping of Nancy Guthrie have been confirmed after a forensic analysis of the doorbell camera footage by the FBI's Operational Technology Division," the FBI's Phoenix office shared in a Feb. 12 X post."We hope this updated description will help concentrate the public tips we are receiving."Savannah Guthrie offers $1 million reward for information on momThe "Today" show host posted an emotional video on Instagram as Arizona authorities continue to search for her mother, Nancy.Feb. 24: Guthrie family adds $1 million reward incentiveMore than three weeks after Nancy Guthrie's abduction, her family added a sense of urgency to the case."It is day 24 since our mom was taken in the dark of night from her bed, and every hour and minute and second and every long night has been agony since then, of worrying about her, and fearing for her, and aching for her, and most of all, just missing her," Savannah Guthrie said in a Feb. 24 video announcing her family's contribution of $1 million to the reward total, which previously was just over $200,000.She also acknowledged, "We also know that she may be lost. She may already be gone." Nonetheless, she urged viewers to "help us bring our beloved mom home."March 26: Savannah Guthrie says some ransom notes were authenticSavannah Guthrie shares emotional plea for missing motherSavannah Guthrie opens up to Hoda Kotb about her mother missing for over 50 days, renewing her plea for her return during a "TODAY" show interview.Ahead of Savannah Guthrie's return to the "Today" show following a two-month hiatus, she sat down with longtime colleague Hoda Kotb for an emotional interview in March. Explaining that she and her siblings "are in agony" over Nancy Guthrie's disappearance, Savannah Guthrie opened up about the ransom notes."There are a lot of different notes, I think that came. And I think most of them, it's my understanding, are not real," she said. "But I believe the two notes that we received that we responded to, I tend to believe those were real."April 6: Savannah Guthrie returns to 'Today'Savannah Guthrie returned to the air on April 6. Wearing a yellow dress in solidarity with the yellow ribbons that supporters have donned in honor of Nancy Guthrie, the 54-year-old journalist told co-anchor Craig Melvin, "It is good to be home.""Well, here we go. Ready or not, let's do the news," Guthrie said as she dove back into her work."It's really hard to come back. I've been trying so hard to hold it together," Guthrie later told her colleague, Jenna Bush Hager. "I cry every morning on the way to work, and I cry every morning on the way home."May 5: FBI Director Kash Patel says FBI was 'kept out' by sheriff's departmentAfter three months with no suspect in custody, Patel criticized the Pima County Sheriff's Department for its handling of the case.On the May 5 episode of Sean Hannity's podcast, Patel agreed with the Fox News personality's assertion that local authorities attempted "to keep [the FBI] out" early in the case. "The first 48 hours of anyone's disappearance are the most critical," Patel added."For four days, we were kept out of the investigation. And when we were finally let in, Sean, look what we did," he said, referring to the surveillance images of the suspect that were released Feb. 10.The sheriff's department, which has repeatedly emphasized its continued partnership with federal partners, pushed back against Patel's characterization in a statement shared with USA TODAY that noted "coordination with the Bureau began without delay.""Sheriff Nanos responded to the scene the night of the incident, providing immediate local leadership and oversight," the statement read. "A member of the FBI Task Force was also notified and present at that scene working alongside our personnel."June 22: Reports emerge that prior ransom note claimed Nancy Guthrie was deadMultiple outlets reported on June 22 that the second message sent to KOLD said Nancy Guthrie died after being kidnapped. NBC News and ABC News cited unnamed people "familiar with" the case, while CBS News referred to "sources who reviewed the notes."CBS reported investigators familiar with the case had reason to believe both notes came from the same person or people.July 27: Savannah Guthrie renews her plea for information about her momWhile taking a break from her "Today" show duties to tape an NBC game show, Savannah Guthrie renewed her appeal for information – and closure – in a July 27 Instagram video."Our family is in agony. We are in a nightmare that will not end; nothing about our situation has changed," she said in the minute-long video. "We will never stop looking for her. We will always ache for her and feel that hole in our hearts."She continued, "I know that you have tried to do things the right way. So I'm asking you, begging you, to do the right thing now. Make the right choice. Help us find her. Tell us where to look for her. I truly believe it is never too late to do the right thing. Help us bring this situation to an end."Contributing: Brendan Morrow and Taijuan Moorman, USA TODAY