Take a look at this thread: [UPDATED 5/16] A.I. Templates - Bot, Car, & +Flying AI - Programming & Scripting - Unreal Engine Forums 
Hi, I would like to know is it possible to make a zombie ai that can: Walk around(randomly), If the player gets in its
line of sight then chases the player, and if it caches the player it will kill him, lastly if the player presses W 3 times it will die.
Any help would be awesome :).
Do you know about Navmesh?
Hi, I’m Roy, on this link you can find a multiple elevator tutorial that you can implement a AI system with it. LET me Know…
a few more tutorials that may help you on your way:
A new, community-hosted Unreal Engine Wiki - Announcements - Unreal Engine Forums1-_Making_AI_Jump_as_a_Part_of_Path_Following
A new, community-hosted Unreal Engine Wiki - Announcements - Unreal Engine Forums2-_Avoidance
A new, community-hosted Unreal Engine Wiki - Announcements - Unreal Engine Forums3-_Random_Wandering
Hi, Here are some video tutorials on how to AI your level.
I will be updating the list.