Police officers who investigate crimes.
detectives
(... a mistery) To find the correct answer to why something happened. (verb)
solve
People who are thought to be guilty of a crime.
suspects
The facts, signs, etc., that tell you who commited a crime.
evidence
(... something) To use the facts and evidence to show something is true.
prove
The crime of killing a person illegally and deliberately.
murder
A person who plans and kills another person.
murderer
People who see something that has happened, and tell the others about it.
witnesses
A person who is hurt or killed by somebody in a crime.
victim