You've been clean from punishments for two months at least, however the reason I banned you was to serve as a lesson not only for you but for many as well.
Like you said you did this in the heat of the moment, which is bad as many players have adopted the mindset of "shoot first, ask questions later".
Not saying we will ban first then ask later, but it's clear what we expect from the players after those million gang-wars:
Gun usage must come with a clean state of mind. Don't immediately start shooting if someone does something wrong or pisses you off. In this case you could've reported him and let us take care of his intentional rulebreaking. Deathmatching only causes further anger with whoever you've killed and only causes more and more trouble...
I'll review this on the 24th of August, make sure you can promise and show us you won't repeat the "ghetto behavior" again.