This is an odd one, and I don't suppose there's anything I can do about it. I work in a largish organisation, and I knew that a fairly senior figure in the organisation was my Mum's boyfriend before she met my Dad.
Over Christmas, I mentioned him, and my Mum said he used to hit her. I questioned her a bit more, and she said it was fairly regular for around a year (until she left him).
Ok, this was many, many years ago, and I suspect he's changed, and my Mum had the sense to split up with him. I just find it shocking that I see this person on around work, and knowing he did this to my Mum, and no doubt other woman, at least in the past.