Comes a Horseman is a 1978 American Western drama film starring Jane Fonda, James Caan, Jason Robards, and Richard Farnsworth, directed by Alan J. Pakula. Set in the American West of the 1940s but not a typical Western, it tells the story of two ranchers (Caan and Fonda) whose small operation is threatened both by economic hardship and the expansionist dreams of a local land baron (Robards).
Farnsworth, a former stuntman, received a nomination for the Academy Award for Best Supporting Actor for his performance. The film grossed $9.6 million at the box office. A stuntman working on this film, Jim Sheppard, was killed while doing a scene where Robards' character is dragged to (presumably) his death. A horse dragging him veered from its course and caused Sheppard to hit his head on a fence post. The scene made it into the movie, but it is cut right before the horse passes through the gate where the fatal accident occurred.
(Summary from Wikipedia)