Dreaming of alive person dead is a warning as per dream interpretation and meaning. It is a sign of something deadly might happen to the person. The dream is also asking you to be nice to people around you.
After seeing dream of alive person dead you can expect to hear news about accidents or illness.
If the person in the dream is a family member then you need to warn the person and ask the person to be more careful about this day today activities.
If the person in the dream is unknown, then you might witness something really bad.
If the person is a mere acquaintance then you need to be careful as you might face accidents in a crowd.