An Outsider dies... then what happens

[Sorrowdusk]

Animate dead only targets corpses. It doesn't matter what the corpse was before it turned into a corpse. I.e. if an outsider dies under circumstances that leave a corpse, that corpse can be targeted by the spell.

Others have mentioned FCII, if you see FCI you will see there is a random (CHAOS!!) chart for demons, they only have a 5% chance of leaving a corpse.