Naresh died in the hospital yesterday, police said.
According to a complaint filed by the victim's wife, Naresh was beaten and tortured on September 6 by Mintu and his son Minu.
The two had lent Rs 40,000 to Naresh which he had already returned but they demanded extra money by adding compound interest to the amount, she said in the complaint.
He refused to pay the extra amount following which the two accused thrashed him on September 6. He was hospitalised the same day, police said.
The body has been sent for post-mortem, police said, adding, a case has been registered against Mintu and Minu who are absconding.