India, Aug. 8 -- Nancy Guthrie Case Latest News: More than six months after 84 year old Nancy Guthrie disappeared from her Catalina Foothills home near Tucson, Arizona, investigators say the case has entered another critical phase. The Pima County Sheriff's Department confirmed there's been a noticeable uptick in tips from the public since the release of two ransom notes that hadn't been made public. Releasing the letters could help authorities identify the writer or generate new leads in a case that has gained national attention.

Nancy disappeared on the night of January 31 after going home and she was reported missing the next day when she failed to show up for church. The FBI and local investigators continue to work together and the G...