23-year-old Pradeep was unemployed and had been living with his brother Sunil in Purana bas area in Bandikui town.
The two brothers had a heated argument last night after which Sunil attacked Pradeep with an iron rod while he was asleep, police said.
Sunil came to police station in the morning and lodged a complaint regarding his brother's death.
Later, Sunil on interrogation confessed to have killed Pradeep, police said, adding that he has been arrested.