A person who commits murder.

plural of murderer

(uncountable) The crime of deliberately killing a person without moral justification.

To deliberately kill (a person or persons) without justification, especially with malice aforethought. / (transitive, sports, figuratively, colloquial, hyperbolic) To defeat decisively.

Of, characterized by, or pertaining to murder or murderers. / Of a person: intending or likely to commit murder; bloodthirsty, homicidal.

simple past tense and past participle of murder

That has been murdered.

plural of murder

Third-person singular simple present indicative form of murder

present participle of murder