The statutory elements of a crime will legally tell you if a crime has been committed.
During the preliminary hearing, a judicial officer determines if a crime was committed. In the United States, the defendant has a right to be assisted by counsel.
It is the place where the crime or alleged crime was believed to have been committed.
To answer the questions, Who - What - When - Where - and How. It is not necessary to determine "why" because if a crime was committed it is immaterial to the investigation to determine the reason.
The perpetrator of a crime is the person who actually committed the crime. A suspect may or may not have committed the crime. A suspect has not been confirmed as being the perpetrator.
By its solution. A crime is only "open" unless it cannot be proven who it was that committed it.
Proof...
. . . . you need to have "probable cause to believe" that an offense is being committed, is about to be committed, or has been committed..
Extradition, or extraditing depends on if the person has been taken to the other state or not.
The accomplice to the crime committed at the jewelry store last night has not been identified yet.
The procedure to be followed when a crime has been committed is to notify law enforcement as soon as possible. Move to a safe place if in danger.
victim
a) He has not committed a crime b) He has not been convicted of committing a crime... c) ...yet.