Hyderabad: An argument between a 60-year-old mason and his son over payment of power bill has resulted in the latter bludgeoning his father to death at their house in Athvelli, Vikarabad on Monday night. On Monday night, Ramachandrayya and Yadaiah had an argument over who should pay the electricity bill. During the argument, Yadaiah hit his father on the head with an iron rod. Ramachandraiah suffered a severe head injury and he was declared brought dead at a local hospital.