Ten days after he was sent to a jail in Haryana for failing to repay a bank loan, a 65-year-old farmer died on Tuesday. Ranbir Singh died on the same day thousands of farmers protested near Delhi demanding loan waiver, pension and subsidised electricity and fuel. Doctors said the farmer may have died of heart attack and are waiting for the post-mortem report. The farmer complained of chest pain on Monday night and was taken to Bhiwani's Civil Hospital where doctors declared him dead on arrival.