The RG Kar administration, which was headed by Ghosh at the time of the incident, was questioned by both courts for the delay and for refusing to make a police complaint at the earliest.
Sanjoy Roy, a volunteer for the community, was first detained by the Kolkata Police and then taken into the custody of the CBI after the Calcutta High Court handed the inquiry to the central agency.
A day after the incident, police detained Sanjay Roy, the main accused. In CCTV footage, Roy was seen entering the building at the approximate time of the incident, and his Bluetooth headphones were discovered close to the scene.
According to the investigation, Roy killed the doctor by suffocating her after seriously injuring and sexually abusing her. A week after the horrific tragedy, the Calcutta High Court gave the CBI control of the investigation in the wake of massive protests and public outrage.