The search for missing student Kori Gauthier, 18, has been narrowed down to one stretch of the Mississippi River after search dogs alerted handlers to the same area twice in one day The search for a missing student has been narrowed down to one stretch of the Mississippi River after search dogs alerted handlers to the same area twice in one day. Louisiana State University freshman Kori Gauthier, 18, has been missing since Tuesday 6, April, when her car was found abandoned on the Mississippi bridge on Baton Rouge after another motorist crashed into it. Rescuers zeroed on the small area of the river on Saturday, but were unable to send in divers because it was considered unsafe.