YouWereKilledBy is a very small, simple addon that displays who landed the killing blow on you when you die in PvP combat. Upon death, a red "You were killed by Lolmoonfire" message will appear near the top of the screen.
The addon currently does not have any settings, you just install it and that's it. I may add some settings to it in the future, but for now I wanted this to be a very simple and tiny addon.
The code itself is an excerpt from the upcoming version of my other project, Paranoia Enemy Player Alert. Please check it out.
Go ahead and post suggestions/feedback/requests in the comments section, I'll try to reply to all of them.