On July 2, Kumar through his advocate had urged prison authorities to provide him a television to remain updated about wrestling matches and other happenings outside the jail.
Kumar was arrested along with co-accused Ajay Kumar on May 23 from outer Delhi's Mundka area.
Kumar was produced before Metropolitan Magistrate Mayank Aggarwal at the end of the 14-day judicial custody. He is facing charges of murder, culpable homicide, and kidnapping.
Delhi Police has sent notice to Kumar to cancel his arms license that was issued to him in 2012.
The accused, identified as Bhupender, Mohit, Gulab and Manjeet, are from Haryana and allegedly active members of the Kala Asauda and Neeraj Bawana gangs.
Kumar was arrested after staying on the run for 18 days after the death of wrestler Dhankar.
Kumar, employed with the Indian Railways, is posted as an Officer on Special Duty (OSD) at Chhattrasal Stadium, where the brawl allegedly took place on May 4.
Sushil Kumar is a prime accused in a case of murder of wrestler Dhankar at Chhatrasal Stadium in Delhi on May 4.
The police questioned Sushil Kumar inside the court and then sought his custody for 12 days for further interrogation in the matter.
The chain of events has left the Indian sports fraternity shocked even though respect for Sushil's achievements remains intact.