Post Mortem

Post Mortem is a 1982 Indian Malayalam-language thriller film directed by J. Sasikumar based on a screenplay by Dr. Pavithran. The film was produced by Pushparajan under the banner of Rajapushpa Productions. The film stars Prem Nazir in the lead role along with Mammootty, Sukumaran and Balan K. Nair in other supporting roles. The film's score was composed by KJ Joy. The film was a commercial success and was remade in four languages – in Tamil in 1983 as Vellai Roja, in Telugu in 1984 as S. P. Bhayankar, in Kannada in 1988 as Dharmathma and in Hindi in 1993 as Tahqiqaat.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.