Umm, how do you resurrect them? Using a resurrect ability? You could use a more general trigger something like:
Event - An Unit Dies Conditions - (Dying Unit) belongs to Neutral Hostile Actions - Wait 60.00 seconds - Create 1 (Random Level x creep unit-type) for Owner of (Dying Unit) at Position of (Dying Unit) - Remove (Dying Unit)
This should work... As long as the corpse of the dying unit does not decay in the 60 seconds or it disappears through other ways (meat wagons, necromancy, cannibalize etc)