A murderer will always be discovered. / (idiomatic) Secrets or hidden crimes will eventually be exposed or discovered; nothing that is secret can remain a secret forever.

A party game, played in a darkened room, in which a designated "murderer" eliminates other players, who must try to identify which player is the murderer.

plural of mass murderer

Agent noun of axe murder: one who axe murders; one who murders using an axe. / (figuratively) Any incredibly dangerous person.

To murder (someone) with an axe.

Alternative form of axe-murder

Alternative form of axe murderer

suicide

plural of axe murderer

An act (such as a suicide bombing) in which an individual kills one or more other persons before, or at the same time as, killing himself or herself; the act of killing others and oneself in this way.