murderer
noun /ˈmɜːdərə(r)/
  /ˈmɜːrdərər/
 - a person who has killed somebody deliberately and illegally synonym killer
- A convicted murderer was on the run last night.
 - a mass murderer (= who has killed a lot of people)
 
Extra ExamplesTopics Crime and punishmentb1- Does the death penalty deter would-be murderers?
 - He protested his innocence and promised to help police track down the real murderer.
 - The identity of her murderer has not yet been revealed.
 - The murderer has struck again.
 - How do we know he's not a mass murderer?
 
Oxford Collocations Dictionaryadjective- accused
 - alleged
 - suspected
 - …
 
- hunt
 - hunt down
 - hunt for
 - …
 
- strike
 - kill somebody
 
- bring a murderer to justice
 - the identity of the murderer