A mysterious, calculating figure who serves as Irina's secret lover and mastermind behind the psychological torture and murders orchestrated against Oliviero. He systematically eliminates witnesses before being betrayed by his partner.
Walter systematically eliminates Floriana as part of his broader vendetta and cleanup.
Walter orchestrates events specifically designed to break Oliviero's mind and frame him for crimes.
Walter commits the murder as a calculated move to manipulate Oliviero's guilt and paranoia.