Ai Controller Problem

Hi World ! i got a question maby someone can help me !? i cant find out how to resolve this problem with Ai Controller , first everything works fine bud 2 little problem i got and cant figurit out how to handle this for first if the NPC kill Me(player character) he still continiue to attack and not turn back to walk rondom location olso after destroy actor “ME” and if me (player character) kill the NPC i use a delay before destroy the death NPC he still face the player as death npc between the delay and destroy actor time ! how can i resolve this little problems THX in advance and sorry for my bad english