The 65-year-old man died in a bioscope last week while watching The Conjuring 2.
The man had complained of chest pains during the film’s climax and fainted shortly afterwards.
He was rushed to a nearby hospital, where doctors pronounced him dead.
His body was sent to the Tiruvannamalai Government Medical College Hospital for a post-mortem but the cadaver, and the person transporting it, have both gone missing.
The story has fuelled panic on Facebook about the supernatural powers of the movie.