Gretna businessman Jackie John Berthelot was approved unanimously by the Gretna City Council on Wednesday to fill the District 4 seat until a special election is held April 5.
The seat became open when former councilwoman Raylyn Beevers was elected without opposition to serve as Second Parish Judge for Division B.
Beevers, who takes office Sept. 5, replaces Judge Stephen Grefer, who was elected to the 24th Judicial District Court.
Mayor Belinda Constant said Berthelot is not prevented from running for the seat after the interim period is over.
Qualifying for the council race is set for Feb. 12 to Feb. 14.