Crimes

What's the verb meaning 'to use facts and evidence to show something is true'?

What is the verb meaning 'to find the correct answer to why something happened?

What do you call people who are hurt or killed by somebody in a crime?

What do you call people who see something which has happened and then tell others (eg. the police) about it?

What do you call the facts, signs, etc. which tell you who committed a crime?

What do you call police officers who investigate crimes?

What do you call people who are thought to be guilty of a crime?

What do you call the crime of killing a person illegally and deliberately?

What do you call a person who kills another person deliberately?