What is the news value of the photo of a dead man?

Link: Conscientious | What is the news value of the photo of a dead man?

My simple rule in all likelihood is too simple. I can already think of all kinds of situations where showing the photograph of a dead person who was unknown to the larger public still would be newsworthy. But what I’m really after here is that when someone says that such a photograph is “newsworthy,” then I’d really like to hear why.