Depending on your situation, you can put the OnDeath script in any of these places:
- Actor base object
- Actor instances
- A different alias for each actor
- A single alias which is reused for each new actor
I haven't tried option 4, but I guess it involves using Clear then ForceRefTo the next actor.
Case 1 and 2 require a script which extends Actor, whereas 3 and 4 must extend ReferenceAlias.