This
;Artificial Intelligence Script
;Conjured Header
desc = corpse
;Triggers
:state=0:state=1
:state=1:setframe=11,state=2
:state=2:incframe=11
:state=2,frameatend=11:state=3
:state=3:suspend,coloff,state=4
;End of Script
will work on the stock models, but you may need to edit it for custom characters to match their death animation if theirs is not 11.
Also, note that it would be better to create death poses from the mesh in a modeling program.
That way, the models could be static instead of dynamic using an animation, which would save your frame rates, especially if there are a lot of bodies laying around.
Another advantage to this is that you would have unique and varying poses, instead of being stuck with the last frame of the stock animations only.