cold case

American  

[kohld keys] / ˈkoʊld ˈkeɪs /

noun

1. a criminal investigation that has remained unsolved for an extended period of time.

   This year's award recipient is a state trooper whose work helped close a cold case from 1983.

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Etymology

Origin of cold case

First recorded in 1970–75

Example Sentences

In August, Netflix announced the series starring Matthew Goode cold case department leader DCI Carl Morck would return for a second season.

From BBC

The breakthrough comes just weeks after the release of the HBO docuseries The Yogurt Shop Murders last month, which revisited the cold case.

From Salon

Since then he’s been an executive producer on “Cover Me,” “Cold Case,” “The Agency” and “New Amsterdam,” among other series.

From Los Angeles Times

The files, created by the Civil Rights Cold Case Records Review Board, are an initial release of federal records related to the case, the National Archives said.

From BBC

“They’re not gonna make my son no cold case, I promise you that.”

From Los Angeles Times