Robert Gutierrez Jr. is charged with sending explicit texts to a 15-year-old girl.
Jefferson County district attorney officials say Gutierrez entered a "blind plea" of guilty .
That means he didn't accept the D.A.'s plea offer.
Authorities say the alleged victim was Gutierrez's foster child several months before the alleged texts were sent.
Gutierrez was a reserve officer for the Ryan Police Department assigned to Ryan Public School.
The judge has ordered a pre-sentence investigation before he decides Gutierrez's punishment.
He's expected to be sentenced Dec. 3.
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