Eyeball (1975)

A group of American tourists is traveling through Spain when two of them are murdered by a mysterious serial killer who removes an eyeball from every one of his victims. The tour presses on as the murders continue, with the travelers and the police trying to deduce which one of them is the killer.
Umberto Lenzi
Martine Brochard, John Richardson, Ines Pellegrini, Andrés Mejuto, Mirta Miller, Daniele Vargas, George Rigaud, Silvia Solar, Raf Baldassarre, José María Blanco, Marta May, John Bartha, Olga Pehar, Verónica Miriel, Olga Montes, Richard Kolin, Rina Mascetti, Fulvio Mingozzi, Vittorio Fanfoni, Francesco Narducci, Tom Felleghy, Lorenzo Piani, Nestore Cavaricci, Carolyn De Fonseca, Laura Trotter
tt0071537