Report to Highlord Tirion Fordring at Hearthglen in Western Plaguelands.
So... you killed a member of the Argent Crusade, inside of Hearthglen. Usually that's not smiled upon, even in self-defense.
I recommend you come back to Mardenholde Keep, and turn yourself in to Highlord Fordring. Hopefully he will hear you out, and will be sympathetic with your situation. I hope I haven't gotten you in any trouble.
You will also receive:
- 4,600 experience
- 350 reputation with Argent Crusade