Gannon and Duarte were now more sure than ever that they were chasing a serial killer — or killers.
In addition to killing their victims, the Smiley Face Killer was believed to have left their signature behind at the scene. Perhaps they were signing their work, as it were, or taunting police. However, any other significance of the symbol remains unclear — as does the explanation for the occasional appearance of the word “Sinsinawa” at some of the death scenes. The smiley killer...
Inside The Disturbing Theory Of The Smiley Face Killer And The Baffling Deaths Behind It
https://books.google.com/books?id=8btRLwEACAAJ
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