Non-filing of it return after death

AMIT (Na) (28 Points)

09 July 2016  
My father passed away in FY 2013-2014. For FY 2013-2014 he had an income from salary [TDS deducted at %30] and FD interest [TDS deducted at %10] ).
I was not aware that he had earned taxable income for that Financial year and i realized only after getting letter/notice in his name recently from IT dept for Non-filing of IT return . What should i do ?
Can i file belated returns in his name , even though last date for belated returns for FY 2013-14 and AY 2014-15 was 31-3-2016 ? Thanks.