A letter of intent not to press charges includes several elements that when pieced together should give a clear picture of events as well as the thought process behind not pressing charges. Letters of intent aim to give the appropriate parties time to digest the contents of the letter while also keeping communication lines untangled.
Write the date and greet the receiver. Introduce yourself, if need be, as in: "Sir, by way of introduction my name is Dewey C. Howe and I am writing to lay out to you my sentiments regarding [fill in date of crime]."
Communicate that certainly a crime has been committed. Give these events in as detailed a manner as you can. Answer the who, what, when, where and why of the crime itself explaining how this relates to the receiver. Like this: "Many witnesses have come to my defense as it relates to that night. You robbed me on that night as I entered the local convenience store on the corner."
Show in writing how you came to the conclusion not to press charges. Reiterate that you very well could have but, in the end intend not to. Consider: "I know now that you were a man jilted by love and that no man with a broken heart can think clearly in such times. Therefore it is my intention to not press charges against you, although it would be well within my right to do so."
Produce your signature at the bottom of the letter: "All Best, Dewey C. Howe"