It's all over the Internet. Apparently there's a Twitter rumor that Kim Jong-un (DPRK) got killed by ninjas today/yesterday, whatever your time zone is (today for me). Considering ninjas are a meme, it's probably fake. Fox Huffington Post (I normally don't go here) New York Times (I don't go here either) I googled all of these.
Wow, even the BBC news are talking about it. But I believe that it said "gunmen" assassinated him, as opposed to "ninjas". So if it did happen, I think that detail would be wrong. http://www.bbc.co.uk/news/world-asia-16993394 In hindsight, considering how many rumors of deaths of celebrities that are spread on Twitter, I will say that its 80% most likely fake.