Article continues below advertisementThe final deadline outlined in an alleged ransom note connected to Nancy Guthrie's disappearance passed Monday night without any proof of life or resolution. At the same time, authorities said they were pursuing "new leads" in the case.Article continues below advertisementOngoing InvestigationSource: NBCNancy Guthrie's ransom deadline passed on Monday, February 9."The investigation into Nancy Guthrie's disappearance remains active and ongoing," a spokesperson for the Pima County Sheriff's Department confirmed Monday evening, per Fox News.