I found this article which has a little more information. One witness (parent for the other team) did not see the referee touch the player. She said the other teams fans started it, and added that the refs had been verbally abused during that game and in another previous game. In fact this altercation was the second time police had been called to the rink that weekend.

Also, this referee is listed as a commissioner on his association/chapters website.

Bonus: More rink rage!