Translation guide
A person who commits a series of murders, often with a pattern. In Japanese, the term is usually expressed as a compound noun or phrase. The most common and direct equivalent is 連続殺人犯, but other terms exist depending on context.
Referring to a person who has committed multiple murders over time, often with a psychological motive.
Standard term for 'serial killer' in news and everyday conversation. Literally 'continuous murder criminal'.
その連続殺人犯はついに逮捕された。
The serial killer was finally arrested.
Loanword from English, commonly used in media and pop culture. Slightly more casual or sensational.
彼は日本で有名なシリアルキラーだ。
He is a famous serial killer in Japan.
Less common variant; 者 (しゃ) is a more formal suffix for 'person'. Used in legal or academic contexts.
連続殺人者の心理分析が行われた。
A psychological analysis of the serial killer was conducted.
Referring to the concept or the series of murders itself, rather than the person.
Means 'serial murder' or 'serial killings'. Used when talking about the crime or case.
この地域で連続殺人が発生している。
A series of murders has been occurring in this area.
連続殺人犯 is the standard, neutral term. シリアルキラー is a loanword often used in entertainment or informal contexts, but it's widely understood. In formal writing or news, stick to 連続殺人犯.
Specifically 'serial murder case'. Common in news reports.
警察は連続殺人事件の捜査を続けている。
The police are continuing the investigation of the serial murder case.