The Pima County Sheriff's Department shared a media release on Friday asking for the public's help in identifying Nancy Guthrie's kidnappers.Six months after Savannah Guthrie's mother's disappearance, the Sheriff's Department released an update that included previously unseen ransom notes. On February 2, a day after Nancy Guthrie was supposedly kidnapped, the purported kidnappers sent a ransom note to KOLD-TV 13 News, a local CBS affiliate in Tucson.In the note, the sender addressed Savannah Guthrie and said, "We have your mother Nancy." The alleged abducter added that Nancy Guthrie would be "held for ransom" and would only be released "unharmed" once payment was received. The sender demanded $4 million in Bitcoin, with a deadline of February 5. The suspected kidnapper also noted that if payment was not made before the deadline, the ransom would be increased to $6 million.The sender stressed that Nancy Guthrie would "be killed" if the demand was not met by February 9 and warned Savannah Guthrie not to "play games." To further establish the authenticity of the note, the alleged kidnapper mentioned that Nancy Guthrie had a "white smart watch on the floor of the foot of her bed" and noted that a floodlight in the backyard of her home "was destroyed." The same local news station received a second note on February 6. The follow-up note addressed the Guthrie Family rather that just Savannah Guthrie and claimed that Nancy Guthrie had already passed away."We did not fully grasp the seriousness of her physical condition. We never intended to hurt her, that was not our intention. She perished shortly after she was taken. We believe it was heart related. She is buried in nature now. Nothing you could have done could have changed the outcome. We want your family to know this and hope you all can find peace. We are truly sorry," the note read.The Shreiff's Department urged people to identify suspects with the "distinctive patterns of word choice, syntax, and phraseology.""We believe these distinctive linguistic characteristics may be recognizable to someone who knows or has interacted with the notes' writer. A friend, family member, coworker, classmate, or acquaintance may recognize these patterns of expression and possess information that could help identify the individual responsible," the Sheriff's department wrote in the press release.Sheriff's Department seeks public's help identifying suspected Nancy Guthrie kidnapperDays after Nancy Guthrie's disappearance, authorities released two doorbell camera videos in which a masked man was seen at the door. The Sheriff's Department noted that these video recordings are vital to understanding the "unidentified male's behavior and choices." The department solicited community support and wrote:"We are asking for the public's continued assistance and are confident that you can further the effort. We know there are individuals familiar with this unidentified male who may have observed changes in his behavior around the timeframe of the videos."The statement stressed that people could share tips about the alleged kidnapper while remaining anonymous. The department also mentioned that anyone who shares information could be eligible for a "reward."Saturday marks six months since Savannah Guthrie's 84-year-old mother went missing. Both the Pima County Sheriff's Department and local FBI agents have been working on the case.Also read: “I am so sorry for your tragic loss”: Marketa Irglova mourns Glen Hansard’s death following motorcycle crash