I primarily remember Michael Gough from a bunch of horror films made by Hammer (and other studios), years before I was aware of his other roles.

And the "killer stalks the circus" film that fat B****rd mentioned earlier was Berserk from 1967, and it also featured Judy Geeson, Diana Dors and Ty Hardin. As I recall, Gough was leaning against a large wooden post (with a knothole or something similar in it) when a large spike was hammered through it from behind, impaling him through the forehead. Was the murderer Joan Crawford, getting her revenge for agreeing to star in this film?

I'll never tell...

Jay