278 rows Unidentified serial killers. This is a list of unidentified serial killers who. 9 Early Warning Signs for Serial Killers. Physical Chemistry Of Metals Darken And Gurry Pdf Creator here. Worried that antisocial kid in school might grow up to be a cold-blooded murderer? Here’s 9 early warning signs for serial. Jan 02, 2013 What makes serial killers tick? Why are they compelled to do what they do? And how can they be recognized? Here are several give-away traits.