Singer Krishnakumar Kunnath, popularly known as KK in film and music industry and also among fans, died of heart attack around 10.30 pm on Tuesday. He was 53 years old and had just completed giving a live performance at Nazrul Manch, Kolkata. Hours before his demise, KK had shared pictures of himself with his team leaving for the concert. He had also shared pictures of him performing.