You would not want to. After a high-profile scandal like that, there are too many people in the know. Not all of whom may be sympathetic to you for taking down a top executive. Your career is effectively finished.

Negotiate a decent severance payout in exchange for keeping quiet about the details. The bonus payout for the misbehaving former CTO may perversely help you here. Start with that figure in how much you want and let the company explain why the victim deserves less.