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Mass murders are usually solved in the US. They have one of the highest "clearance rates" of just about any type of murder. However, some cases remain open...
One of the more disturbing ones was the "Tinley Park massacre" from February 2008, where six women were shot by an unknown gunman during a suspected robbery at a clothing store in Tinley Park, Illinois, a southwestern suburb of Chicago. Five died. There are no publicly-named suspects to date, and no arrests.
That same year, in November, there was a quintuple homicide at a homeless encampment near the 405 freeway in Long Beach, California - it has also gone unsolved:
Post 9/11 anthrax attacks? I know that the case is considered closed by the FBI, and the suspect, Bruce Ivins, killed himself prior to arrest, but many question whether he was guilty, or at least the only one involved.
2001 anthrax attacks
That zodiac guy. I think that was in the 70's? I saw a TV show where the son found a piece of clothing that the zodiac used to wear on his head when he committed the crimes in his deceased father's personal stuff, and other things that tied him to it, but I don't think it was conclusive.
Location: Prescott Valley, Az (unfortunately still here)
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Worst unsolved crimes in the last 70 years:
1. The Zodiac Killer
2. The Texarkana Moonlight Killer (1940's)
3. The Keddie Murders
4. The Anthrax Attacks
5. Death of Jonbenet Ramsey
6. The Black Dahlia Murder
7. Dr. Sam Shepard case (did he kill his wife or not?)
8. Princess Doe case (who was she and who killed her?)
Most of these are on the west coast. I wonder why.
Good question.
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