I don't buy the foul play theories. What could this person possibly reveal that is worse that has already come out? They crashed two 737 Max's full of passengers for crying out loud.
Names. Criminal charges require heads to fall on to pierce the corporate veil. He had names. Likely dates too. He had evidence of them committing acts that carry prison terms which would not by any stretch be short.
He was the number one threat to everyone at that company at that time, that was complicit in cutting corners.
