According to police, the incident took place under Adampur Police Station when six assailants came in a car last night to a milk shop owned by Vijay Kumar.
Two of the attackers first slapped Kumar and then fired at him. However, Kumar escaped unhurt and the bullets hit Vinod Kumar, a milk vendor, who was working in the shop, they said, adding, the assailants fled from the spot after the incident.
The protesters demanded arrest of the culprits, they said.
SP Satender Gupta along with heavy police forces reached the spot to take stock of the situation.
The body of the deceased has been taken into custody.
A case under section 302 (murder) has been registered against six persons and one of the them has been detained for interrogation, police said.