Darragh Smith, who subbed at four high schools in the district, was immediately terminated from his position, officials said.
No students are believed to be involved.
Full statement from Klein ISD:
"Klein ISD considers the safety of our students as our highest priority. We were just made aware that a substitute teacher, Darragh Smith, was arrested and charged with attempted aggravated assault of a minor/online solicitation. The district immediately terminated Smith's employment. Findings currently suggest that no Klein students were involved; however, we will continue to monitor the case. Out of an abundance of caution, we also notified parents of students attending the four high schools where Smith subbed over the last year and two months."
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