Assuming they kept the traditional style of the real-world Shogunate, then there would be a ritual in front of spectators. This is also a more realistic way for MCT to do it as even if they're not particularly suspicious, they'd still have mechanisms in place to make sure the executive actually follows through and doesn't chicken out.
Some additional points to consider:
-
How does MCT handle corpse processing and the funeral? Possibly this wiki page might be a good place to look. The fake is gonna have to pass at each step.
-
If your average wage slave dies, then either the kids go to corporate school for mandatory brainwashing and training, or the whole family goes straight to the streets. Executive level is different. Family is expected to be cared for. Life insurance payouts to a suddenly vanished family is a loose end that needs to be accounted for.