'Phantom of Death' aka 'Un delitto poco comune'(1987)  Dir. Ruggero Deodato.

The infamous cannibal King's thrillingly Graphic late-cycle Giallo finds frustrated inspector, Datti (Donald Pleasence) increasingly confounded by a series of especially gruesome slayings. The maniacal killer's malign modus operandi born of a dreadful degenerative disease provides a compellingly novel premise. The bravura bloodletting, eerily atmospheric Venetian locations, and maestro, Pino Donnagio's sinuous score is complemented with some exceptionally fine performances. Not exactly sympathetic, Michael York's perverse pianist, Robert Dominici arguably remains one of Gialli's more memorably girl goring malcontents. While the 90s would herald the death knell for inventive Spaghetti splatter, Ruggero Deodato's delirious aria of death-dealing dementia orchestrated a spectacularly sanguineous requiem to a wholly unrepeatable era of operatic, uniquely Italianate horror insanity!