Mutumbo's assassination is the event used to frame Swagger and conceal a larger crime.
Swagger is positioned to assess a supposed presidential assassination, but the remote-controlled rifle kills Mutumbo instead.
Johnson treats Mutumbo as a threat to the conspiracy's secrecy.
The plot states that Johnson ordered the Serbian sniper to assassinate Mutumbo because Mutumbo was going to discuss the village massacre.
The assassination becomes the central case through which Memphis uncovers the conspiracy.
Memphis investigates Mutumbo's assassination and discovers that it was carried out with a remote-controlled gun.
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