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.
Check out his top 10 songs here:
1. Tadap Tadap - Hum Dil De Chuke Sanam
2. Dil Ibaadat - Tum Mile
3. Tu Jo Mila - Bajrangi Bhaijaan
4. India Waale - Happy New Year
5. Tune Maari Entriyaan - Gunday
6. Dus Bahane Karke Le Gaye Dil - Dus
7. Khuda Jaane - Bachna Ae Haseeno
8. Kya Mujhe Pyaar Hai - Woh Lamhe
9. Aankhon Mein Teri Ajab Si - Om Shanti Om