noun
Loanword from English; used in crime reporting and fiction. The native term 連続殺人犯 is also common.
See also: 連続殺人犯
その小説の犯人は冷酷なシリアルキラーだった。
The culprit in that novel was a cold-blooded serial killer.
The police are investigating it as the work of a serial killer.