In case you haven't heard, Kevin Westgarth almost killed a guy.  Westgarth got into it with Garrett Klotz of the Philadelphia Phantoms and knocked him out with a few rights to the head.  Klotz crumpled to the ground alongside the boards and then apparently went into a seizure.  Here's the fight:

I don't have to much to say about the fight other than seizures are a scary thing (and that was a solid right by Westgarth), but you can read an argument against fighting here and a rebuttal here.  I don't mind people inserting their own opinions on the subject in the comments, but try to keep it civil.