What does it mean when you see someone dead that is actually alive in your dream?

There is no particular significance in being looked at by anyone in a dream, whether the individual is living or dead or completely imaginary. Old superstitions about such dreams causing death were concocted during pre-scientific ages to explain the mystery of why some persons died in their sleep for no apparent reason. Modern medicine has shown that such deaths have completely natural causes such as Heart disease. Dreams do not cause death.