Tad Cummins was placed on the TBI's Top 10 Most Wanted List.
Cummins, 50, is charged with kidnapping Thomas, 15, who has not been seen since last Monday, March 13.
Authorities alleged Cummins had sexual contact with Elizabeth weeks before kidnapping her. Whatley says Elizabeth's family believes the teen was "conflicted" about her relationship with him, and that Cummins "groomed" her.
Thomas brother James said this turn of events has devastated their family and he would like for Cummins to do what's right.
After being suspended, Cummins took to Instagram, posting things like "It was love at first sight" and "Something handsome is on the horizon", leading many to wonder, what happened during those 14 days when Cummins and Thomas were at school together?
Elizabeth had a "troubled life", authorities said.
"Tad, this is not you". She was last seen at a Columbia, Tenn. restaurant.
"The district does not tolerate any manner of behavior that is alleged in this incident and will take swift action to remove parties from school campuses who are involved with investigations of this type", the statement said.More news: Kourtney Kardashian flashes her cleavage in sexy Instagram snap
Tips are coming in, but no one has reported seeing the vehicle or Cummins and Thomas, officials said. I believe it's clear at this point that her removal by him is unlawful.
"If it is true that contact between this student and Mr. Cummins has continued in light of these allegations, I can tell you that my client will use whatever legal means are at his disposal, including filing suit, to assist Maury County Schools in protecting (Elizabeth) from Mr. Cummins", the attorney wrote. Another family member added, "Bring her back to us or allow her to call and let us know she is ok". "This is a 15-year-old child who has led a hard life", said Josh Devine with the Tennessee Bureau of Investigation.
"Like so many of you, I'm deeply troubled by what has happened in the past few days", she said with her family pastor by her side. "This is not who you are", Jill Cummins said during a news conference.
"We all love you very much and we miss you. the house is not the same without you here".
Cummins is described as white, 6 feet tall and 200 pounds, with brown hair and brown eyes.
"You just hope that you're going to find her alive".
Cummins may be driving a 2015 Nissan Rouge with Tennessee license plate 976 ZPT and is believed to be armed with two handguns, the TBI said.
Elizabeth Thomas is described as a 15-year-old white female with hazel eyes and blonde hair.