Texas Government Code - GOV'T § 44.143. Collin County

(a) The criminal district attorney of Collin County shall attend each term and session of the district courts in Collin County held for the transaction of criminal business. He shall represent the state in all criminal and civil cases in the courts in the county unless otherwise provided by law.

(b) The criminal district attorney has all the powers, duties, and privileges in Collin County relating to criminal or civil matters involving the county or state that are conferred by law on county and district attorneys in the various counties and districts.

(c) A vacancy in the office of criminal district attorney is filled by appointment by the Commissioners Court of Collin County. The appointee holds office until the next general election.