Superargo contro Diabolikus
From Killing N. 34: "Il bacio della morte" (February 1968):
From Killing N. 47: "Odio per odio" (September 1968):
Not the best quality but this is him as Fortunato Arena's butler in Terza ipotesi su un caso di perfetta strategia criminale
In this forum there are scans from the fotoromanzo nero James Bix N. 3: "S.O.S. Floride" and there we find him again (and also Fulvio Mingozzi):
James Bix was made with Aldo Agliata (who played Killing) after the Killing fotoromanzi came to an end in France. It's very strange but it looks like James Bix was made especially for France and only published there even though it was made in Italy with Italian actors...
I have also found in Le avventure di Ray Kolman N. 34: "Un'orchidea rossa di sangue" (published September 1972) in a relatively big role but he was uncredited. But I am very sure that there must be some fotoromanzi where he is credited. The search goes on...