When a murder turns cold, it only enhances the horror of the tragedy—and the intrigue. Cases like the Black Dahlia slaying, the death of JonBenét Ramsey, and the 1922 double homicide known as the Hall-Mills Murder all had suspects, but to this day, nobody has ever been held accountable.

Let us know which notorious crime keeps you up at night, wondering whodunnit and how they managed to escape capture or even suspicion. Give us the scoop on the case, and elaborate on why it’s the one real-life mystery that you’d most like to see solved.

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Top image: the Black Dahlia and Bob Crane (both AP Photo); the Notorious B.I.G. (AP Photo/Mark Lennihan, File)