The Tennessee Bureau of Investigation confirmed they have seized new evidence in the missing person's case of Shelley Mook.
Mook, a beloved eighth grade teacher at Harris Middle School in Shelbyville, disappeared nearly three years ago on February 28, 2011 at the age of 24.
Investigators said she went to her ex-husband's home to drop off their six-year-old daughter.
Her car was found later that night in a field just outside of Murfreesboro. Police said it had been set on fire.
Mook was never found and investigators suspect foul play.
Her ex-husband, Tyler Mook, is believed to be the last person to have seen her alive. The TBI searched his home, but he was never arrested.
Authorities say he is still considered a person of interest.
The new evidence in the case was seized on December 27. Investigators reported they confiscated the van of Tyler Mook's neighbor.
The details of the confiscation, however, are not being released.
Over the years, searches and vigils were organized by friends and family in an effort to bring Mook home.
The last occurred in the fall of 2012 when the TBI received new leads and searched for Mook in a rural area near a set of railroad tracks in Franklin County.
A $20,000 reward is being offered for information leading to Mook's whereabouts.
Anyone with information is urged to call the TBI at 1-800-TBI-FIND.