ACB accused died under investigation

Hi, My father (A.O) who is an employee in revenue department , kurnool . It is to inform that a criminal case under prevention of corruption under section 13(1) (b) was registered on my father in sep 2019,on allegations of Possesing disproportionate assets. He was released on bail in nov 2019 . The ACB officials seized all the property and bank accounts and validated the disproportionate assets around 1 crore. Recently my father(A.O) died in may 2021 due to covid-19.He remained under suspension till then. Till now no chargesheet has been filed or no notice has been given. The case is still under investigation and till now no chargesheet has been filed . What is the legal position of this case further and and how to get seized assets released to legal heirs.