Appointment of new director

There were two directors in a pvt ltd company. One of the directors died. A new director has to be appointed but the address KYC of the registered office has not yet been done. For doing the address KYC, the Digital signature of both the existing directors have to be used but again, one of the directors has died. 

How can we get a solution to this problem. 

Would really appreciate your insights. 

Thank you.