A third candidate seeking to fill an opening on the O’Donnell school board filed Thursday.Casey Boone filed on the last day candidates could submit the necessary paperwork for a spot on the Nov. 8 ballot.Boone faces two other candidates, Blandon Hancock and Travis Walters, in the race to finish out an unexpired term on the board.One board seat has been vacant since June when former board member Melissa Pedroza resigned because she was moving outside the district. Board members are required to be residents of the school district.Whoever is elected will serve the 2.5 years remaining on Pedroza’s three-year term.Early ...