Jim Clark was appointed Thursday to replace Van Stone as Benton County prosecuting attorney.
Clark will be sworn in at 1 p.m. today by retired Judge David Clinger.
Gov. Mike Beebe appointed Clark to serve the remainder of Stone's term which ends Dec. 31.
Stone announced a few weeks ago that he would not seek his third term. Stone is resigning in order to take a position with the legal department for Walmart Stores Inc.
Clark was a Rogers deputy city attorney and he retired from the city in January.
Nathan Smith, a deputy prosecutor, and Kimberly Weber, a Rogers attorney, are candidates for the prosecutor's position in the May 20 election.