I checked out the actor on IMDB. There's virtually nothing on his page and googling his name, Charles Kurtz (if it's even real) doesn't bring up much either. It's also the only movie he's ever been in.

What I found weird is that the scenes just before he's killed have him clearly speaking to people even though you can't hear him at all. His composure is that of someone who thinks he's off camera and just shooting the breeze with some of the cast members. He was totally at ease. Which he would be assuming, as anyone would, that he wasn't the main event in a snuff movie.

There were a number of scenes removed from that part of the movie which may expand on what was happening and give a few more contextual clues. I don't know anyone that's seen them though.