Probably not. I would consider it, as long as I had guarantees that A) I wouldn’t be held criminally liable, and B) I’d still get paid if it were a fatal punch.
One well-placed shot with heel of your palm on an upward path to the nose will put anybody…anybody…on their ass. Whether or not they ever get up again depends on if bone fragments make their way into the person’s brain or not.
However, the aftermath would probably be ugly. If you wind up killing them, then you have to walk around with that on your conscience. And even if not, people will probably walk around wanting a piece of whoever knocked out Tyson (or whoever)
On preview, Ashes, it not as easy as the movies show, but it’s not all that difficult either. If your opponent has his eyes closed and hands behind his back, just about anyone could pull it off.