Who killed Gwen Stacy?

Green Goblin killed her technically as he threw her off the bridge but modern physics have shown that it was actually Spiderman's webbing that he used to try and save her that actually killed her as the impact slowed her momentum down and broke, I believe her neck, she was dead by the time he had pulled her back up to safety. So actually it was Spiderman who killed Gwen though if he hadn't she would have died anyway from the fall so it's sort of a combination of the Goblin and Spiderman.