It may happen in the case of soul-mates. Especially in the East this is often seen, where a man may love a girl or a woman whom he has seen only once and there is no chance of his ever seeing her again. Then, if he dies, she may become obsessed. She can think of nothing else but his thought and she becomes half dead, and is often in a trance. It may not be that she loved him very much, but his thought obsesses her, and she feels his condition only.