The last one was released in July 2011 and I loved to read them. I thought the stories were in depth and you got to learn about a lot of the champions. Was there any information given on why they stopped producing them?
Riot decided that the Journal of Justice (as well as the Judgement for Individual Champions) was not the best way to present future League of Legends lore. There are two outstanding issues of the Journal of Justice slated for the near-future, after which it will stop entirely.