Tax filing for a deceased peron by a legal representative

My brother passed away in Dec' 2005. Till financial year 2010-2011, his wife is filing income tax as a legal representative.

I asked my friend who is CA - he told there is nothing wrong in filing tax by LR.

I have tried googling it, but could not find any number of years, till which it can be filed by LR.

I feel LR can file just for that financial year he died; but after that it needs to be stopped.

Property/ Capital should be transferred to the legal heirs/  or as per the WILL.

Please let me know if she should stop filing tax or can she continue as a LR.