Tex. R. Disc. P. 2.15
A Respondent given written notice of the allegations and rule violations complained of, in accordance with Rule 2.14, shall notify the Chief Disciplinary Counsel whether the Respondent seeks to have the Complaint heard in a district court of proper venue, with or without a jury, or by an Evidentiary Panel of the Committee. The election must be in writing and served upon the Chief Disciplinary Counsel no later than twenty days after the Respondent's receipt of written notification pursuant to Rule 2.14. If the Respondent timely elects to have the Complaint heard in a district court, the matter will proceed in accordance with Part III hereof. If the Respondent timely elects to have the Complaint heard by an Evidentiary Panel, the matter will proceed in accordance with Rules 2.17 and 2.18. A Respondent's failure to timely file an election shall conclusively be deemed as an affirmative election to proceed in accordance with Rules 2.17 and 2.18.
Tex. R. Disc. P. 2.15