Kumar was arrested by the Gurgaon police as the main accused in the case. However, the Central Bureau of Investigation (CBI) today gave him a clean chit and sought his discharge from the case.
The central probe agency has named 127 people as witnesses in the case, of whom 19 have been arrayed as prime witnesses, including two judicial officers.
A prime witness is one who is directly associated with the case and his version substantially helps to corroborate the prosecution's arguments.
Some of the prime witnesses are the school's gardener, Harpal, who first saw the body of Pradyuman, the seven-year- old victim, and teachers.
In the chargesheet, the CBI has said there is no evidence against Kumar, who is currently out on bail, and that he was coerced by the Gurgaon police to confess to the crime.