The prosecutor plays a part in King's Ransom, where you must rebut his evidence that Anna Sinclair was the murderer of Lord Sinclair. He has the following evidence:
Anna's fingerprints on the dagger
Anna having bought poison and not used it
A thread from Anna's clothing being found at the crime scene
Anna being at the scene of the crime
After successfully defending her, he will accuse you of helping a cold-blooded murderer go free when you talk to him at the end of the case.