He's always maintained that he never laid a hand on her, and to my knowledge, that's never been contradicted by anyone...not that we've ever gotten to hear the wife's side of the story, however. The charges were domestic assault and preventing a 911 call...clearly something went on, and it wasn't good.
At the end of the day, though, this is a league where Chapman and Osuna are still carrying on productive, lucrative careers... Wright's greatest crime was not being able to stay healthy for 5 minutes.