R.I.P.
The cowards that did this will be hunted down real quick. I am sure there are a lot of people in that area that are in rage of this. Somebody will talk, it never fails.
Something similar like this happen to my college instructor (Mark) this pass weekend in Boston. He saw two guys molesting a women. He walked up to them and question them what was going on. One guy punch him on the right side of his face, but foolishly made a mistake as my instructor is a 2nd degree black belt. The first guy was taken down real quick but the second guy had a wood club or something. Unfortunately, Mark could not reacted fast enough as he took one hit to the left side of his eye socket (sp) of the frontal bone (that is the ridge from side of eye socket to top). He was knocked out, laying up against a building for 30-45 mins before anybody notice him. He may have to get surgery as the area of the bone is fractor.