That's a ridiculous idea. If you commit suicide because of years of depression that you can't get out of and don't have any positive outlook on the future, you wouldn't care about wisleblowing and bringing some bad rep to a company.

And especially you wouldn't cover up your suicide. You wouldn't want to lie to your family about the cause of your dead just to get back at some company you worked for.

I don't think this is a good theory. I don't see the logic in that. Much more logical if he was assassinated because he was spreading info that people with big money didn't want out.