- HD 1080
- Runtime: 99m.
- Status: Released
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- Languages: it
- Country: Italy
- Director: Duccio Tessari
- Stars: Helmut Berger, Giancarlo Sbragia, Ida Galli, Wendy D'Olive, Günther Stoll
- keywords: whodunit, playing piano, murder investigation, miscarriage of justice, giallo
- Production_studio: Filmes Cinematografica
- Slogan: A brutal murder cannot be solved. But the murderer has been recognized by someone...
- The The Bloodstained Butterfly is featured in the top rankings of 1971
- #38 in Top Thriller Movies of 1971
- #21 in Top Mystery Movies of 1971
- #27 in Top Horror Movies of 1971
When a young female student is savagely killed in a park during a thunderstorm, the culprit seems obvious: TV sports personality Alessandro Marchi, seen fleeing the scene of the crime by numerous eyewitnesses. The evidence against him is damning... but is it all too convenient? And when the killer strikes again while Marchi is in custody, it quickly becomes apparent that there's more to the case than meets the eye...