KDFW-TV reports that Scott Paul Alcaraz is facing two counts of sexual assault. If convicted, he faces up to 20 years in prison.
Authorities say the girl has accused the 26-year-old former math teacher and assistant basketball coach of having sex with her in a classroom at Thomas C. Marsh Middle School.
The Dallas school district fired Alcaraz on Monday after his arrest last week.
Alcaraz is free on a $50,000 bond. Court records did not list an attorney for him.
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