On December 9, 2019, Mayor Terrell filed as a candidate for the office of County Commissioner resulting in an automatic resignation on the Allen City Council. His resignation is in accordance with Section 7.04(5) of the Allen City Charter which states "Should the mayor, a member of the city council or any appointed member of a council-appointed commission, committee or study group become a candidate for any elective public office other than the office presently held, such candidacy shall constitute an automatic resignation of such office."
Mayor Terrell has continued to serve in accordance with the Texas Constitution which provides a holdover provision. Additionally, the Texas Constitution and the Allen City Charter provides for the Council to appoint to fill a vacancy for an unexpired term of 12 months or less rather than having to call a special election.