" 'Investigating Director'[- (a)] means a Director of Public Prosecutions appointed under section 13(1)[(aA) or] (b)[- (i) to the Directorate of Special Operations; or (ii)] as the head of an Investigating Directorate established in terms of section 7(1) [(1A) , as the case may be; and (b) in Chapter 5, includes the head of the Directorate of Special Operations];";