I’m assuming she won’t be because she was his subordinate.
That’s how it works.
I used to work for a guy who had a very high position at a company. All was good on Friday. On Monday, he was gone.
Rumor had it he was sleeping with a subordinate and some weekend office shenanigans were caught on a security camera. She was an active participant but remains employed.
I know she won’t be fired. I’m saying that policy SHOULD be to fire them both, regardless, as a means of discouraging this.