How many incidents have there been in the past, oh say five years, where an illegal alien killed US citizens? Including those where it was not just a stupid mistake due to not reading English road signs, but intentional murder? Dozens? Maybe a hundred or more?
So are you saying that every one of those is appropriate for inclusion as a separate Wikipedia article? C'mon, man. Try to focus on what an encyclopedia is. It's not somebody's blog, it's a source of data. So how would this become data rather than a sensational blog post?
Well there -IS- one way that this accident, and other killings of US citizens by illegal aliens would make it into Wikipedia. That is on a summary page, of which there are thousands already on various topics. Something like "Incidents Involving the Death of US Citizens Due to Illegal Aliens" (although I'm sure they'd word it a little differently).
That -- the summary article-- is IMO very arguably encyclopedia worthy.