Either he was under investigation before his last show was broadcast or he's admitted whatever it is for his exit to be so swift. I liked him back in the day on R1. On R2 I found him self-important, full of innuendo, which is rarely if ever appropriate, and decidedly unfunny. His interactions with listeners were awful.
As someone said upthread, it's never the women presenters whose conduct is called into question.
Gary Davies is getting a lot of criticism here, but at least he's a proper radio DJ, not just some z list celebrity they've put behind the mic. Give OJ the break he deserves!