Although the investigation began over a complaint that his ninth-grade class reading list contained a book about a murderer who has sex with his victims' bodies, Tierce was not indicted on a charge of providing harmful material to a minor, a misdemeanor.
His attorney did not immediately return a call to The Associated Press on Monday.
According to the indictment, Tierce requested that one girl go to his house when no one else was there.
Taylor County sheriff's Sgt. John Cummins said Tierce allegedly asked her to come to his home under a "normal pretense," then allegedly kissed her and exposed himself to her.
Tierce asked another girl "what she would be willing to do for a better grade" and asked a third girl for sexual favors, according to the indictment. All of the incidents allegedly happened in 2005.
Tierce taught pre-Advanced Placement English and was an assistant football coach at Jim Ned High School in Tuscola, about 20 miles south of Abilene, until he was placed on paid leave a year ago.
That was after a 14-year-old student's parents filed a complaint with the Taylor County Sheriff's Office, saying Pulitzer Prize-winning novelist Cormac McCarthy's "Child of God" was too graphic for teens.
But amid the uproar, most people in the West Texas town of 700 seemed to rally around Tierce, saying he should be reinstated because he was a great teacher and coach. Some students and athletes even wore armbands emblazoned with Tierce's initials.
Later allegations surfaced concerning an inappropriate relationship between Tierce and at least one former student.
In March, the Jim Ned school board voted not to renew Tierce's teaching contract for the current school year, the Abilene Reporter-News reported in Monday editions.
Tierce is under review by the State Board for Educator Certification's Professional Discipline Unit, according to the agency's Web site. The review is standard when a teacher is being investigated by law enforcement for alleged criminal conduct, but Tierce's teacher certification could be revoked.
Slideshow archive | ABC13 wireless | Headlines at a glance