The Klingon government just released this announcement.
The High Council is sad to report that what was supposed to be a routine meeting to discuss new relations with the new Imperial Government, turned into a battle. Admiral Johns, obviously upset about something, chose to insult and challenge a high ranking member of the Empire. The Council has reported that the challenge was conducted within the guidelines of the Klingon Code of Honor. The Admiral fought and died with honor, and the Council considers this matter closed.
They also still wish to extend talks with the Federation, and Admiral Johns' body will be returned to the Sol System as soon as a transport becomes available. Glory and honor to the Empire!