Their secret sexual encounter becomes a central lead in the murder investigation.
Regis determines that Kyle had sex with Carla on the night she was murdered.
Jordan uses Carla's death as the trigger for a broader political conspiracy.
The investigation reveals that Jordan engineered Carla's murder as part of a plan to blackmail President Neil.
Cash's presence in Carla's photograph links the Secret Service to the murder inquiry.
Regis sees Cash in a photograph of Carla and uses the connection to investigate Kyle's encounter with her.
Luchessi's prior interest in Carla makes him an early suspect.
The plot states that Luchessi had once made a pass at Carla.
Although Carla is dead before the investigation develops, her death becomes central to the president's crisis.
Carla's murder is engineered to create blackmail leverage against President Neil and force his resignation.
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