Shamsuddin was stabbed with a sharp-edged weapon during a fight with Mohit and his two accomplices last evening while he was sitting with five-six other men from the area, police said.
The victim's family lives in Mongolpuri but he had a jhuggi in Haiderpur and would come there often, a senior police officer said.
The fight started after Mohit accused Shamsuddin of slapping his younger brother Narendra and quarreling over small issues, police said.
Guddu and Suraj, Mohit's accomplices, have been arrested while he is absconding, the officer said.
Shamsuddin often used to pick up fights and cases of physical assault and robbery were registered against him, the officer added.