According to the police, the deceased, who has been identified as Lilu, was a "bad character" in the police records and had several cases against his name.
The incident occurred on Sunday night when Lilu and his wife Pinky were sitting outside their residence after a power cut in the area.
"When a 65-year-old man, who stayed in the neighbouring area, came and urinated on the street, Lilu objected and later slapped the person following an argument. Soon the two sons of the elderly man came to their father's rescue and a fight broke between Lilu and them," Deputy Commissioner of Police (DCP) Chinmoy Biswal said.
"One of two brothers then picked up a big cement slab from the street and hit Lilu on the head with it. The accused repeatedly hit Lilu until he become unconscious. The victim was rushed to the AIIMS trauma centre where he was declared brought dead.
"We have identified the accused persons, who also suffered injuries during the fight. We will get them soon. The police has registered a case of murder against accused under IPC section of murder," Biswal said.
During investigation, it was also found that Lilu was a repeat offender who was involved in several cases of snatching and robbery. He was a also a history-sheeter in the Delhi Police dossier, the DCP added.
( With inputs from IANS )