When Narcissus was born the seer Tiresias was asked whether this child would live a long life and the seer replied: "If he never knows himself" [Tiresias. Ovid, Metamorphoses 3.350]
Many nymphs and youths had been mocked by Narcissus, until one of them prayed to heaven: "So may he himself love, and not gain the thing he loves" [Ovid, Metamorphoses 3.405]
When later Narcissus discovered his image in a pool, he fell in love with who he called "Echo", who could only repeat his own words. Not being able to find consolation, he died of sorrow by the same pool. It is said that Narcissus still keeps gazing on his image in the waters of the river Styx in the Underworld.
After his death, a single flower remained in the spot where he had gazed endlessly into his own reflection in the pool-- "a snare for the bloom-like girl." For it was while she, attracted by the sweet scent of the narcissus, gathered flowers over a meadow, that the earth opened and Hades sprang out upon her with his immortal horses, and took her with him to be the queen of the Underworld.
In another strange twist to the story, some believe that Echo was actually Narcissus' twin sister whom he loved dearly, and he would gaze into his reflection because he could see her in himself. His sister, equally beautiful to Narcissus himself, fell for one of her many suiters. Narcissus eventually died from the deep guilt, heartbreak and sorrow of his forbidden love.