Gwen Stacy and Peter were a couple for several years. She dies in
Amazing Spider-Man #121, probably the single most important event in
Spider-Man's long history. Peter was deeply in love with Gwen at the time,
and things were all the more tragic given that her father died not long before
that, in Amazing Spider-Man 90.
Gwen is thrown from the top of a bridge tower by a man in a Goblin costume, but
exactly who is responsible for her death?