On the Season finale of What Makes a Killer: On November 17th 2006, police in the German city of Cologne searched the vehicle of a 47-year man suspected of murder. What they found inside the truck was a collection of gruesome memorabilia. That day, police apprehended Volker Eckert, bringing an end to a 32 year career of murder that spanned five European countries. To this day, the exact number of his victims is still unknown.
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