KK dies at 53: Akshay Kumar, Pritam, Armaan Malik and other celebs mourn the singer's death - watch video

Playback singer KK breathed his last on May 31 (Tuesday). The 53-year-old singer died after suffering a heart attack post his live concert in Kolkata.

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.

Several singers, musicians and other Bollywood celebrities took to social media to mourn the singer's unfortunate and untimely demise.

Expressing her grief, Sonal Chauhan posted on her social media account, “A voice that perhaps means a little more to me than the others. A voice that introduced me to the world that defines me. A voice that perhaps is the reason why the country fell in love with Zoya. And a voice that I later got the honour to collaborate with (kaise bataun tujhe) Everytime KK sir touched my life, he created magic. And that was his gift. His magic went beyond the physical boundaries and touched millions of souls. KK sir you’ll always be special to me. Thank you for adding your magic to my life. Gone too soon. Wish you had stayed ZARA SA aur."