Yager is ultimately identified as the person responsible for poisoning Bard.
Bard had been investigating Yager for a malpractice suit. The investigation concludes that Yager stole Bard's evidence and poisoned the liquor.
Flossie's observation provides the evidence linking Yager to the crime scene.
While attempting to collect Bard's debt, Flossie saw Yager unlock and enter Bard's apartment.
Both men obstruct the investigation, but for different reasons and through separate deceptions.
Arthur stages a fake suicide to protect Nora, while Yager attempts to conceal the poisoning and remove Bard's body from police custody.
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