a no longer useful pawn in the service of others [word for?]

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Persian (Farsi)
Do you have any idea what is the word used to describe a person who has been used by others like a pawn but who is no longer supposed to serve the others' purposes. For example, if some one plays the role of a spy in a place and provides secret and important information to others but who eventually is removed from that place as he is no longer intended to serve the others' purposes.
I'm looking for the right compound noun that describes such a person/pawn.
I would be grateful if you kindly help me find the two word signifying such "a no longer useful pawn". Thanks in advance
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