1 / 6Singer KK’s demise has come as a shock to the entire country. Legendary singer Krishnakumar Kunnath or KK breathed his last yesterday, May 31st after a live performance in Kolkata’s Nazrul Mancha. And now, the initial post-mortem report of the musician claims that KK died of a cardiac arrest. A senior official told PTI that he had been suffering from ‘prolonged cardiac issues’. 2 / 6As per PTI, KK died after suffering from cardiac arrest. A senior official told the news agency, “The initial report suggested that the singer died because of myocardial infarction. There was no foul play behind his death. Clinical examination also found that the singer was having prolonged cardiac issues,” the officer said.3 / 6After his concert at Nazrul Mancha in Kolkata last night, KK returned to his hotel as he felt unwell. When his health deteriorated, he was rushed to the city’s CMRI hospital where he was declared dead on arrival. 4 / 6KK was known for songs like 'Pal' and 'Yaaron', which went on to become big hits among teens in the late 1990s, often heard during school and college farewells and teen cultural events.5 / 6The singer's sudden death after a concert in Kolkata had raised several questions about the arrangements at the venue.6 / 6Staff members of Nazrul Manch auditorium in South Kolkata said that the venue was overcrowded during the KK concert.