Section 41B(3) in THE PUNJAB MUNICIPAL CORPORATION LAW (EXTENSION TO CHANDIGARH) ACT, 1994
(3)On the occurrence of any casual vacancy in the office of the Chairperson, the Wards Committee shall, within one month of occurrence of such a vacancy, elect one of its members who is a councillor as Chairperson:Provided that where a vacancy has arisen on the resignation or death of the only councillor on the Committee, the Administrator may appoint any other councillor as Chairperson of the Ward Committee till election is held to fill the vacancy in due course.