What does it mean when you dream of people dying right before they happen?

Not much. Perhaps it was a coincidence, or perhaps they were headed that way. Dreams reflect hopes and fears. There is a saying in journalism: "If you didn't write it down, it didn't happen." This is said to remind people that your memory of dreams and even real events is flawed, so keep a notebook if this sort of thing is interesting to you. Just telling the story again and again tells nothing.