Veteran singer KK, whose full name is Krishnakumar Kunnath, passed away on May 31 in Kolkata due to a heart attack. The singer, 53, felt uneasy after his concert at a college fest at Nazrul Mancha auditorium, Kolkata. Soon after, it was reported that he suffered a heart attack and could not be recovered. His untimely demise left a void among his family, friends and fans.