[Lord_Greywolf]

i do not think the weapon used at the time he was killed is stored

but you can get the current weapon he is holding
just do a findon layer check for 1handed and 2 hand layers and if base weapon - then you have it

BUT if what i am thinking you really want is this:
if the critter was killed using a certain weapon
then either extra gold, items, etc etc would be in corpse
or something happens to weapon or owner

then you need to do the check in the onafterdeath (or was it ondeath) part of the critters script
(or put that overide in)
onbeforedeath might work also