First, you shouldn't have asked your question, which leads people to think it is a character ass-ination. Just post the log and let the plot speak for itself.
Killing someone while they are ranking is valid for 95% of character roles. Killing someone you know has recently died and has full gear is also just fine for a high percentage of roles & players. Following a ghost? Pricelessly evil. At least he didn't multi-kill you in this log, although he might have reason to do so now.
I agree about stacking plague though. That's just completely wank game mechanic, and a good reason why people join cabals and gear for saves.