Thinking Sideways: The Smiley Face Murders

In 2008, a group of investigators went public with a story they'd been looking into since 1997, involving more than 45 deaths. If true, the theory is that one of the most prolific serial killers ever is currently on the loose, killing athletic college-aged men. But the links between these 45 deaths are thin, at best, and the argument for the Smiley Face Killer might not be as strong as many think.

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