talk to police, see what immediate options are available and if that doesn't work... there are a few very nice bearded fellows that would probably have a talk with him about the error of his ways in most cities. just look for the leather jackets and big Harley Davidson bike outside of a bar. they usually have 3 patches on their backs. all joking aside though, my family has gone through the same sort of thing and the non police fellows were very helpful mediating the breakup, move out and town change for the bf...

Put him in a coffin first

I think you need to get some friends to have a talk with the boy soon.

She's got screwed-up priorities. She didn't even mention if he was rich or not.

Strength in numbers. Find him and kick about eight feet of shit out of him.