killer [ˈkɪlə(r)]

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n.杀人者，杀人犯，杀手，屠杀者

someone who kills another person

Heart attacks have become Britain's No.1 killer disease. 心脏病已成为英国的头号致命疾病。
The bulk of the evidence points to him as her killer. 大量证据证明是他杀死她的。