City of the Living Dead (1980) on Netflix

In New York, the medium Mary Woodhouse sees Father William Thomas committing suicide by hanging himself in a cemetery in Dunwich. His death opens the gates of Hell permitting the rise of the dead. Mary is so frightened with what she sees that she dies in a séance. The snoopy reporter Peter Bell covers the death of Mary and goes to the cemetery. Out of the blue, Mary awakes locked in the coffin and Peter hears her screams and saves her. She tells what happened and Peter invites her to go to Dunwich with him. Meanwhile in Dunwich there are weird deaths and Peter and Mary meet the psychiatrist Gerry and his friend Sandra to find out the grave of Father Thomas to close the gates of Hell before All Saints Day; otherwise the dead will raise and destroy the living. Will they succeed in their intent?