The JonBenét Ramsey case is a tragic cold case. In 1996, the six - year - old beauty queen was found murdered in her family's home. There was a great deal of media attention and many different theories emerged. The case has had multiple investigations over the years, yet the truth about what really happened to JonBenét remains elusive.
One well - known cold case based on a true story is the Zodiac Killer case. It's a mystery that has haunted the San Francisco area for decades. The killer sent cryptic letters and symbols to the police and media, and his identity still remains mostly unknown despite numerous investigations.
The Black Dahlia case is also a famous cold case. Elizabeth Short was brutally murdered in 1947. Her body was found in a way that shocked the nation. Over the years, there have been many theories and suspects, but the case has never been fully solved. It's a case full of mystery and speculation.