Del. Kenneth Cooper Alexander (D-Norfolk) on Wednesday announced his candidacy for the race to fill the seat of the late Sen. Yvonne Miller.

Del. Kenneth C. Alexander ( D-Norfolk), left, looks at a redistricting map during a House of Delegates debate in April. (Bob Brown/AP)

“She dedicated her life to the success of generations that would follow her and left a legacy committed to ensuring a better tomorrow for our families and community,’’ he said. “It is an honor to bring the mantle of her leadership forward as we continue to build a better life for our children, ensure the accountability of government and confront today’s challenges of unemployment, health care and transportation.’’

Gov. Bob McDonnell (R) announced Wednesday that the state will hold special elections Sept. 4 to fill both Miller’s seat and that of Del. David Englin (D-Alexandria), who resigned.

Political parties have until the first week of August to nominate candidates.