You cooperated with law enforcement and gave info about another person. What there a contract between you and the officers for help? Were you working off another thing with the officer to aid you in past troubles? Did you give incrimidating statements against you in your statement to law enforcement concerning the other person? Sound like someone else gave a statement against you and someone made a charging decision against you so you need to get an attorney and defend yourself.
The prosecutor can present the case directly to a state Grand Jury without a prior arrest/citation on the charge. The state Grand Jury can also request that a warrant be issued for your arrest. You need to hire a criminal defense attorney ASAP.
I am trying to give you a general answer to your question. We do not have an attorney-client relationship by this response on the avvo website. I have not been retained to represent you. I am licensed to practice law in Kentucky and in federal court in this state and the Southern District of Indiana. You need to seek legal advice from an attorney licensed to practice in your area..