Cowan, TN (WHNT) -- It's been a year and a half, and there's still no sign of missing Tennessee teacher Shelley Mook. But investigators aren't giving up. On Thursday morning search teams went out on the fourth ground search since Mook went missing on February 28, 2011.
Teams from the Bedford County Sheriff's Department, Franklin County Sheriff's Department, Cowan Police Department, and various Emergency Management Agencies started their search at the Cowan Rail Yard. Investigators say a tip led them to the previously unsearched area.
Despite several false alarms, Mook's body was not discovered during Thursday's search.
Mook was last seen in Shelbyville, TN while she was dropping off her daughter at her ex-husband, Tyler Mook's house.
She later missed an appointment with a maintenance worker at her home. In the middle of the night, on March 1st, her car was found in flames. Her body was not inside.
Tyler Mook first reported her missing, and is a person of interest in the case.
A $20,000 reward is being offered for anyone with information that leads to an arrest or conviction in this case. People are asked to call 1-800-TBI-FIND.