L'uccello dalle piume di cristallo (The Bird With the Crystal Plumage)
The killer is Monica Ranieri (Eva Renzi) the wife of the art gallery owner Alberto Ranieri (Umberto Rahi). What Sam (Tony Mustane) saw earlier of Monica struggling with the black-clad killer was Alberto struggling with Monica who was trying to kill HIM. Traumatized by a childhood sexual assault, Monica fliped out and began killing women she saw as prettier than her. Alberto covered for her, being the loyal husband. Alberto ends up falling to his death and Monica is arrested before she can kill Sam or his girlfriend Julia (Suzy Kendall).
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