Some of the other prime witnesses are the school's gardener, Harpal, who first saw the body of the seven-year-old victim, and teachers.
The charge sheet had no mention of Ryan Pinto, Augustine Francis Pinto and Grace Pinto, promoters and top management executives of the private school who were granted anticipatory bail.
The CBI also gave a clean chit to school bus conductor Ashok Kumar, who was earlier arrested by the Gurgaon Police, and sought his discharge.
The probe agency had seized the hard disc of a computer, a mobile phone and some other gadgets from the residence of the teenager to figure out his thought process.
Ryan schoolboy murder case: CBI denies questioning Gurgaon cops, Haryana police begins internal enquiry into shoddy probe
Gurgaon police has initiated an internal enquiry to ascertain the reasons for goof up by the police officials responsible for the probe into the sensational incident.
Pradyuman's father claimed that Haryana cabinet minister Rao Narbir Singh told them not to ask for a probe, a day before Haryana Chief Minister Manohar Lal Khattar announced it.
Gurgaon schoolboy murder: 'CBI probing second Ryan International student’s role in Pradyuman's killing'
The Central Bureau of Investigation is probing role of second student in the murder of Pradyuman Thakur murder case, said sources.
Gurgaon schoolboy murder: Ryan International trustees Pinto family’s bail plea adjourned till November 17
The Punjab and Haryana High Court on Friday adjourned the hearing in the bail plea of Pinto family till November 17, in connection with Pradyuman murder case.
Ryan schoolboy murder: CBI should grill Pintos in my son's murder case, says Pradyuman Thakur's father
The owners of the Ryan School, the Pintos had filed the anticipatory bail petition in the Punjab and Haryana High Court which granted interim bail to them till December 5.
Gurgaon schoolboy murder: Class 11 Ryan International student confesses to killing Pradyuman, says CBI
In its note seeking remand of the 16-year-old student from the juvenile court in Gurugram, the agency said that his custodial interrogation was needed to ascertain if other people were involved.
Haryana Chief Minister Manohar Lal Khattar also defended the state police claiming that its investigations were not complete when the probe was handed over to the CBI.
Gurgaon schoolboy murder: Class 11 student accused of killing Pradyuman sent to three-day CBI custody
The CBI did not find any evidence against bus conductor Ashok Kumar, who was the Gurgaon Police's sole accused in the gruesome killing.
The CBI sources said the 10-member team will try to gather evidence and make an attempt to recreate the events of the day Pradyuman, a class 2 student, was killed.
Gurgaon schoolboy murder: CBI hasn't received notification from Haryana government for further investigation
Pradyuman’s father Varun Thakur has expressed disappointment over the delay in handing over the case to the CBI even after the chief minister’s announcement.
The media has been barred from entering the school premises in Bhondsi, on Sohna road, as it can cause undue disturbances.