On Sunday, Shankar had gone to drop Balbir to Anand Vihar from where the latter was to catch a bus to his village in Uttar Pradesh for attending a wedding, the police said.
When they reached the bus stop, they consumed liquor. Balbir then asked Shankar for his jacket which he refused leading to a quarrel, they said.
During the quarrel, Shankar hit Balbir on the head with a stick and the latter lost consciousness. Shankar was nabbed from the spot while Balbir was rushed to LBS Hospital, where he was declared brought dead, the police said.