Somewhat similar to its federal counterpart, Indiana Rule of Evidence 410 provides in relevant part that
Evidence of a plea of guilty or admission of the charge which was later withdrawn, or a plea of nolo contendere, or of an offer so to plead to the crime charged or any other crime, or of statements made in connection with any of the foregoing withdrawn pleas or offers, is not admissible in any civil or criminal action, case or proceeding against the person who made the plea or offer.
So, is a letter of apology written by the defendant to the victim inadmissible under this Rule? According to the recent opinion of the Supreme Court of Indiana in Gonzalez v. State, 2010 WL 1988134 (Ind. 2010), the answer is "yes" if the letter was written as part of the plea bargaining process.