Tex. R. Disc. P. 17.09
No lawsuit may be instituted against any Complainant or witness predicated upon the filing of a Grievance or participation in the attorney disciplinary and disability system. All members of the Commission, the Chief Disciplinary Counsel (including Special Assistant Disciplinary Counsel appointed by the Commission and attorneys employed on a contract basis by the Chief Disciplinary Counsel), all members of Committees, all members of the Board of Disciplinary Appeals, all members of the District Disability Committees, all officers and Directors of the State Bar, and the staff members of the aforementioned entities are immune from suit for any conduct in the course of their official duties. The immunity is absolute and unqualified and extends to all actions at law or in equity.
Tex. R. Disc. P. 17.09