'The Walking Dead': Steven Ogg ... Even I Don't Know Who We Killed Off!!

Even the stars of "The Walking Dead" don't know who got offed in Sunday's season finale.

Steven Ogg -- who plays the main Saviour on the show -- swears ignorance. The question ... do you believe him?

We know bad guy and Saviour leader Negan killed off one of the main characters, but the scene cuts to black before revealing the victim.

The Internet's leading theory ... nobody knows who died because showrunners haven't decided. If true, they would have shot multiple endings.

If you think you know Ogg from somewhere else -- he's the voice of Trevor in Grand Theft Auto V.