6. Zhou Kehua

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As serial killers go, Zhou Kehua seems to have had a fairly common motivation for his crimes: money. Suspected of killing at least ten people in the Jiangsu, Hunan and Chongqing  regions of China between 2004 and 2012, the former mercenary would simply shoot his victims and take their money. He was known to target people using ATM machines. Zhou was shot and killed himself during a gun battle with police during August of 2012.