I thought the same thing. It sure sounds like something happened. Either inappropriate conduct, alcohol, drugs, mental illness, something along those lines.
I also saw an article from the News & Observer that said this:
In an interview on Wednesday, WRAL vice president and general manager Joel Davis declined to give specifics regarding Fishel’s departure, but said that “the way it played out it would have been impossible for him to continue here, but he offered up his resignation. … At the end of the day what I can say is that it was imperative from my point of view that it be clear that this was due to a personnel matter. This is something that was not the station’s doing.”