State Sen. Linda Lopez will leave her seat Jan. 13.
Lopez submitted a letter of resignation in December, effective on the first day of the 2014 legislative session. She accepted a position with the Easter Seals Blake Foundation.
Her move triggers a series of steps to appoint a replacement.
Within three days of Jan. 13, the secretary of state will notify the state Democratic Party of the vacancy. Then the precinct committeemen, the leadership of the party in the legislative district, have five days to nominate three people to replace Lopez.
The Pima County Board of Supervisors will appoint one of the three to fill the remainder of the term, through 2014.
Anyone who lives in the district may run for election this fall to serve a full two-year term starting in January 2015.