Following the demise of singer Krishnakumar Kunnath, popularly known as KK, on Tuesday night, Kolkata Police has registered a case of unnatural death in connection with the sudden death. As per the reports, the singer fell ill while performing at an event in Kolkata on May 31 and was brought to the CMRI hospital. The singer was later declared dead. The case has been registered at the New Market police station where the police are awaiting the late singer’s family. According to the police, after getting the family’s consent and body identification process, an inquest and post-mortem will be conducted. “The mortal remains of KK will be handed over to the family after the postmortem,” said the police. A probe into the matter is underway. Investigators are waiting for the preliminary report of the postmortem.