Metropolitan Magistrate Ashok Kumar allowed police to interrogate Azad Choudhary alias Bhola, 24, till July 24.
Justice Kumar Tuesday sent three youths - Sanjay Basoya, 24, Shakti Basoya, 21, and Rajiv, 25 - to police custody till July 24.
Akha Salouni was beaten to death Monday following a spat with the youths while he was going to a friend's house in south Delhi's Kotla Mubarakpur area.
Police told the court that the fifth accused Lokesh, who is on the run, could be traced with Choudhary's help and sought his custodial interrogation. Choudhary, a driver by profession, was arrested Tuesday.
According to police, all four belong to Garhi area in south Delhi but were picked up from various other places in the capital.