The Airport: Turmoil @ T3

One of the busiest weekends in one of the busiest airports of the world, the T-3 terminal of the I.G.I. airport, New Delhi, India. 1,30,000 passenger coming and going during the entire night, and then it happens... The staff discovers a man sitting on one of the chairs of the pew, who hasn't moved for the last three hours. Is he dead? If yes, did he die a natural death? Or, someone killed him? If yes, who?