A vacancy is set to be declared on West Norfolk Council under non-attendance rules.
Claire Kittow, a Labour member for the St Margarets and St Nicholas ward, ceased to be a councillor in April having not attended any council meeting for six months.
Under local government legislation, councillors automatically cease to hold their office after six months of non-attendance, unless the authority has approved a stated explanation for it.
A report published ahead of this Thursday’s council meeting, where the vacancy is expected to be formally declared, said no approval for non-attendance had been given.
The declaration of a vacancy will enable a by-election to take place to fill the seat.