Seeing a dream of someone dying is considered neither good nor bad as per those who believe in dream interpretation. In Hindu religion there is an ancient scripture known as Swapna Shastra which gives interpretation and meaning of various dreams.
Meaning Of Seeing A Dream Of Someone Dying
Such dreams are mostly result of some kind of fear and they need not be taken seriously.
But if you happen to see the dream without any daytime influence or thoughts, then it should be taken seriously. It is a kind of warning to be careful.
It is also a sign asking you to help the particular person overcome difficulties. Sometimes you can save the person from accidents or doing something that might take the life of the person.