Section 21(7)(b) in All India Services (Death-Cum-Retirement Benefits) Rules, 1958
(b)Immediately on the death of a nominee in respect of whom no special provision has been made in the nomination under clause (a) of sub-rule (4) or on the occurrence of any event by reason of which the nomination becomes invalid in pursuance of clause (b) of that sub-rule (5), a member of the service shall send to his Accounts Officer a notice in writing formally cancelling the nomination together with a fresh nomination made in accordance with this rule.