Do Gaz Zameen Ke Neeche (1972)

A wealthy scientist saves a young girl from the hands of some thugs and offers her protection in his house. That night she slips into his bed and claims she did it because she felt safe there. The research scientist, who works with something that will help people getting longer lifespan… is a gentleman and offers to marry her. The couple are soon married, but the twist in the tale is that his bride wants to get his money and together with her lover and a sleazy uncle they kill the scientist and bury is body deep in the woods. Being a Hindu, his soul remains restless without cremation and the scientist returns from the dead as a zombie to avenge his death.