The Mayor and each of the councilmembers, and any other elective officers, shall be a citizen of the United States of America and a qualified voter of the State of Texas; shall reside within the corporate limits of the City of Harker Heights; and shall not be in arrears in the payment of any taxes or any other liability due the City or be disqualified by reason of provisions of any other section of this charter. A member of the council ceasing to possess any of the qualifications specified in this section, or any other section of this charter, or convicted of a felony while in office shall immediately forfeit his office.