Regis initially treats Luchessi as a suspect before recognizing that the evidence may have been planted.
Regis questions Luchessi after he is arrested because he was unaccounted for and had once made a pass at Carla.
Luchessi's prior interest in Carla makes him an early suspect.
The plot states that Luchessi had once made a pass at Carla.
Luchessi is used as a disposable suspect in the murder cover-up.
Luchessi's testimony and a clearly staged piece of evidence initially implicate him, while the later investigation reveals a wider conspiracy.
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