That post was in relation to the 'opening the gym' situation posted much earlier in the thread. My bad if that wasn't clear.
As far as the GZ/TM case, my take is GZ was wrong for 'stalking' and TM was wrong to attack first. It is a tragedy, and the more so because of how it has been exploited.
With the understanding that Wikipedia is what it is, here's its page on manslaughter:
http://en.wikipedia.org/wiki/Manslaughter
According to that page, I could possibly see it as 'constructive manslaughter' with the criminal act on GZ's part being stalking (but, then, I don't really know the legal definition of stalking either.) I don't see how the case falls into the other definitions of manslaughter, much less murder.
I also see the case from GZ's perspective of getting his head bashed on the concrete, however. This, of course, assumes that what he has related is the truth.