Well-known Bollywood singer Krishnakumar Kunnath, popularly known as KK, died in Kolkata on Tuesday night, officials said.
He was 53.
KK was feeling unwell after reaching his hotel, following a performance at a concert in the evening where he sang for almost an hour, officials said.
He was taken to a private hospital in south Kolkata where doctors declared him brought dead, they said.
"It's unfortunate that we could not treat him," a senior official of the hospital said.
KK, known as a versatile singer, has recorded songs in Hindi, Tamil, Telugu, Kannada, Malayalam, Marathi and Bengali, among other languages.
Delhi-born playback singer shot to fame with iconic numbers — Chor Aaye Woh Galiya (Maachis), Yaaro Dosti Badi Hi Haseen hai (Rockford) and Sach Keh Rah Hai (RHTDM).
After the news of the death of the popular singer broke, Twitter was in shock. While many paid tributes, several others expressed disbelief over the loss.
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