Despawning a Killable without a copy in the pool

Is there a way to despawn an object without having to have a copy of the prefab in the pool?  I have the player and several enemies that never need to be respawned, but I wish to use the pool only for despawning since they all have Killables on them.  For example, I have a player already in the scene when the game starts and when he dies, the game ends and the level reloads.  I don't mind putting a player prefab in the pool ahead of time to prevent the game-stopping error, but I have lots of other items that never need to be respawned.  I only use the pool for bullets.