CCTV footage shows singer Krishnakumar Kunnath, better known as KK, wandering in the corridor of a Kolkata hotel before falling ill and complaining of chest trouble. CCTV footage shows the singer going about with a towel around his neck following his live show on Sunday. KK was apparently rushed to the hospital after collapsing in the hotel and was later declared dead. The singer died of heart arrest, according to the autopsy report. According to the early findings of the autopsy report, there was no foul play involved in the singer's death.