Dead Bodies
From The DarkMod Wiki
To create a dead body in your mission:
Create entity > darkmod > ragdoll then select the one you want. Place it approximately where you want it to fall. You can't pose it like in Thief as far as I know so it falls like a ragdoll.
Though, you can move it around in-game (use cvar g_dragEntity 1), and then use the saveRagdolls console command to write the ragdoll position out to the map file.