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серийный убийцаacentos
gen. serial killer (Translucid Mushroom); multiple murderer (Mermaiden)
crim. mass murder (Despite Cosby keeping mostly to his cell, where he eats and exercises, another inmate that is a mass murder has it out for him, Radar Online reported. andreon)
idiom. pattern killer (из фильма Terminator (00:22:43) Александр У)