There are many options.
Probation/parole officer. Juvenile detention officer. CADAC (drug abuse counselor).
Legal field: paralegal. Attorney. Crime Victim advocate (help them navigate the judicial system as they monitor what happens to the suspect). Working for the Innocence Project to try to get wrongfully convicted people released from prison, etc.
Journalism. Big cities tend to have "Crime" reporters, "court house reporters," etc
Analyst: working for police departments to analyze crime trends.
CSI: Some police departments have civilian investigators.