1)whether they can file to conduct the case through their legal heirer
Two Question arise : first whether the complainant seeks personal exemption on each and every date
Second : whether the complainant has given the authorities to his counsel to appear on his behalf duly allowed by court
if not then the accused may object on the next date that the complainant has not been appeared since last 6 year and the court will take its own recourse.
2) any time limit after death of complintant legal heirer to proceed the case.
being the case is criminal in nature hence there is no time has been prescribed however the plea as suggested by Mr R Trivedi may be taken. It has been lapsed long time now it is open to court to grant the extension or not.
3) any chance to interupt the accused to take defence.
the accused may take the defence for none appearance on behalf of the complainant or other way as to be suggest by contested counsel.