What event inspired a conspiracy theory centered around the "grassy knoll?"

Theories that posit that there were multiple gunmen involved in President John F. Kennedy's assassination place one of the shooters on the "grassy knoll" in Dealey Plaza. Even the Warren Commission, which was in charge of investigating the assassination, speculated that there might be a second gunman on the grassy knoll.

Asked by Christina Loprieno · Last updated 5 years ago · 3.9K views · SOURCE