The Supreme Court on Monday voiced concern over the absence of a key document that was needed for the postmortem of the medic raped and murdered at the RG Kar Medical College in Kolkata, and asked the CBI to investigate into it.

A bench headed by Chief Justice D Y Chandrachud said there was no reference of the ‘challan’ (document) used, and sought an answer from the CBI and the West Bengal government. “Where is the challan of the body when it was handed over for postmortem? the bench also comprising Justice J B Pardiwala and Justice Manoj Misra said.