The penalty for aiding and abetting (Complicity) under Ohio law is the same as the penalty for the principal offense. Aggravated Robbery under Ohio law is a First Degree Felony carrying a prison sentence of 3 to 10 years and a fine of up to $20,000. If you're talking about a federal offense, the penalties are even more severe.
The fact that you made the mistake of talking to the police (especially without an attorney) dramatically increases the chances that you will be charged. You should never, and I mean NEVER speak to a law enforcement officer on such a serious matter without the advice of an attorney.
Dan J. Weisenburger
Attorney at Law