Sheriff Bobby J. Guidroz said the initial complaint in the case was received on Jan. 12 of this year.
Investigators then met with an 18-year-old who said she had been sexually abused by someone known to her family from the time she was 13 until she turned 17.
On Wednesday, officers arrested Billy T. Bertrand, 50, of 181 Triple T Lane and charged him with one count of molestation of a juvenile and oral sexual battery.
Under rules of 27th District Court for sex offense cases, nothing else was released regarding the case, and all information in the case file from this point will be sealed.
That information includes any information regarding line-up, bond or bond application, arraignment or any other pre-trial activity, except for any grand jury report.