AIKEN --- An Aiken County schoolteacher was arrested Tuesday on accusations that she engaged in sexual activity with a former student.

Tammy Joy Key, 38, of Cottage Street, was charged with four counts of lewd act and four counts of criminal sexual conduct with a minor, Aiken County sheriff's Sgt. Dave Myers said in a news release. She remains in the Aiken County Detention Center.

Investigators think Ms. Key had sex with a 14-year-old boy between August 2005 and March 2006 at her Graniteville home. She also is accused of committing lewd acts on the victim between August and September 2005 at Leavelle McCampbell Middle School, where she teaches math.

The sheriff's office alerted the Aiken County school district of Ms. Key's arrest Tuesday morning, Sgt. Myers said. The sheriff's office has not been told of any other victims, he said.

The alleged victim was an Aiken County student but is not enrolled at Leavelle McCampbell, said Cecelia Davidson, the associate superintendent for administration.

Ms. Key formerly taught at Langley Bath Clearwater Middle School, said Joyce Stanley, the human resources director.

She was placed on administrative leave with pay after her arrest Tuesday.

"The board of education is the only one that can suspend a teacher's pay," Ms. Stanley said.

The board will meet Tuesday.

Staff writer Julia Sellers contributed to this report.