Article continues below advertisementFormer FBI agent Jennifer Coffindaffer believes authorities may be closing in on a suspect in Nancy Guthrie's kidnapping case.During the first week of March, nonprofit organization United Cajun Navy offered a "full operation package" to the lead sheriff on the case, Chris Nanos - however, Nanos reportedly never took them up on the offer.His response made Coffindaffer think the investigation is heating up after going six weeks without identifying a suspect.