As a subject matter expert in comic book lore and superhero narratives, I can provide an answer to your question about the character Gwen Stacy in the Spider-Man universe.
In the original comic book storyline, Gwen Stacy is portrayed as the first serious love interest of Peter Parker, who is Spider-Man. Her death is a pivotal moment in the series and is caused by the Green Goblin, whose real identity is Norman Osborn. The Green Goblin, in a fit of madness and power, throws Gwen off a bridge during a battle with Spider-Man. Spider-Man attempts to save her using his webbing, but the sudden stop causes her neck to snap, leading to her death. This tragic event has a profound impact on Peter Parker's life and is a classic example of the themes of responsibility and loss that are central to Spider-Man's character.
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