News style uses 事件 for crimes and 事故 for accidents, so the choice of word already tells listeners that a crime is suspected.
Common collocations
- 殺人事件が起きる: a murder occurs
- 殺人事件を捜査する: to investigate a murder case
- 殺人事件の容疑者: a suspect in a murder case
- 未解決の殺人事件: an unsolved murder case
Similar words
- 殺人: murder, homicide — the act or the crime itself, without the "case" framing
- 殺人未遂: attempted murder — where the victim survives
- 事件: incident, case — the general word for a criminal or newsworthy occurrence