A recent development in the Nancy Guthrie case has led to a slight increase in tips. Authorities released two credible ransom notes that were sent to her family after she was abducted. The release of these notes has generated some additional information, according to the sheriff's department.

For more details on the case and the investigation, readers can refer to the original report from ABC13 Houston, as the available information is limited to the increase in tips following the release of the ransom notes.