The Death of Mario Ricci (1983)

Gian-Maria Volonte stars as a TV newscaster who journeys to a remote alpine village to interview a famed malnutrition expert. Upon his arrival, Volonte learns that there's an ongoing investigation in the village concerning the mysterious death of an Italian immigrant. Inexorably, the journalist becomes involved in the investigation, and with equal inexorability the chain of evidence leads to the nutritionist.