No need to quote so much from the codex... killing without warning (once) may only be considered "borderly" ok, in a specific threatened land. Of course, Luna is no such place. NO ONE is allowed to do this.
Killing and re-killing is not even a RP crime, it is a crime against the RP community (and not just the against ones character), and should be dealt as such.
When someone is killed the second time... do nothing but send a hail over ICQ and wait a minute. You may get good, reliable witnesses and maybe a good PVPer to help you, before you lose everything.
As for proof against any murderer or culprit, there are two good ways to find/accuse them:
1. Always use UO Journal. This way you will have the exact happening of things, including language used, names and could also have names of witnesses.
2. Hit "Print Screen" and paste to "Paint". if you have the culprit's paperdoll open on it, much better. This could be used with www.uo.com character find, so you can match a photo with the official UO paperdoll.
As for your case... Although Charlie has some PC problems and Kodoz is in Japan, I have absolutely no doubt that they will address this issue immediately.
Also: there is no character named "Arthr" on catskills. If you had a typing mistake, please correct it. There are (on catskills) 4 "Arthur", 1 "artur" and 2 "Arthur ..." so until then... be careful of those 7.