Iranian student Neda Agha-Soltan was shot dead in Tehran during the presidential election protests; footage of her death was widely distributed over the Internet, making it "probably the most widely witnessed death in human history".

Killing of Neda Agha-Soltan
Neda Agha-Soltan was an Iranian student of philosophy, who was participating in the 2009 presidential election protests with her music teacher, and was walking back to her car when she was fatally shot in the upper chest.
2009 Iranian presidential election protests
After incumbent president Mahmoud Ahmadinejad declared victory in the 2009 Iranian presidential election, protests broke out in major cities across Iran in support of opposition candidates Mir-Hossein Mousavi and Mehdi Karroubi. The protests continued until 2010, and were titled the Iranian Green Movement by their proponents, reflecting Mousavi's campaign theme, and Persian Awakening, Persian Spring or Green Revolution.
Viral video
Viral videos are videos that become popular through a viral process of Internet sharing, primarily through video sharing websites such as YouTube as well as social media and email. For a video to be shareable or spreadable, it must focus on the social logics and cultural practices that have enabled and popularized these new platforms.