This letter was given to our agency by the police. We believe this letter is addressed to the Russian man in the photos with Groom. Because of this letter we now know him to be Novichkov Pavlovich and that he is the one who bribed Groom to transport the drugs. We suspect that the purpose of this letter was for Groom to inform Novichkov that he could no longer transport the drugs because it was getting too dangerous. In return, this letter could have evoked the attack response from Novichkov that we saw on video. Knowing the name of our suspect is a huge advantage in our investigation and will get us closer to finding him.