Sidney Bouvier Gilstrap-Portley has been charged with indecency with a child. Authorities allege he was dating a 14-year-old girl while pretending to be a student.
Gilstrap-Portley's attorney didn't immediately return an email on Sunday seeking comment.
Court records show he was released Friday on bond on the new charge.
Gilstrap-Portley had already faced a charge of tampering with government records after first being arrested in May.
Dallas school district officials say Gilstrap-Portley first enrolled at Skyline High School and later moved to Hillcrest High School, where he joined the basketball team.