Learn what "the cops couldn't find who the murderer was" means, when people say it, and how to use it naturally in English.

It means the police were not able to figure out who committed the murder.
From School Hall, Episode 23
Someone says the police were unable to identify the murderer.
Use this when reporting that investigators failed to identify the person responsible. It is understandable, but the wording is informal because of cops.
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