ST. AUGUSTINE, Fla. -- A 27-year-old St. Johns County teacher was jailed this weekend on charges she had a sexual relationship with a 13-year-old boy, according to a report.

Kelly Lynn Dalecki (pictured, left), a teacher at Hartley Elementary School in St. Augustine, reportedly met the boy as a family friend, WJXT-TV reported.

"They started an e-mail kind of relationship in early January of this year and then actually met a few times," said Tom Hill of the St. Johns County Sheriff's Office.

Investigators said Dalecki sent the Flagler County boy sexually explicit e-mails and pornographic materials, and had a sexual encounter with the teen. The two spent time together at Dalecki's home and met once in a public park.

Investigators said the boy's parents discovered the e-mails Dalecki had been sending to their son.

Dalecki, who was taking a leave of absence from teaching to pursue her master's degree, is in the St. Johns County Jail on a $50,000 bond. She faces charges of lewd and lascivious battery in St. Johns and Flagler counties, along with 12 counts of distributing harmful material to a minor in Flagler County.

Investigators said they believe this is an isolated incident and there are no more victims.