If you are the bishop and you were assassinated, are you still protected from the warlord in that turn? I'm guessing you are, and this question also hints that you are, but the rules are not clear so I wondered whether it really is the case.
Yes, the Bishop loses his protection when assassinated. From the last page of the FAQ
Q: Can the warlord destroy a building of a murdered Bishop?
A: Yes. Since the Bishop is not present, he is not able to protect his districts.