It wasn’t anything confirmed, and looking into it he’s married (although some articles mention his wife, while others talk about her as his ex-wife?) so maybe he didn’t sleep with her. However I definitely saw a few things suggesting he’d interacted with a cop’s ex-wife somehow, and that was supposedly what stirred things. It was probably from reddit or YouTube comments, though, so who knows if it’s actually true.
In any case, the report from their CI (the official reason) was full of holes, and it’s ludicrous that a judge granted a warrant over that. No wonder that another judge in the same area has allowed all of this to proceed to trial.
Edit: I found this comment that mentions him fucking a Sheriff’s wife. It might be mentioned in his album.