summarize the grassy-knoll theory

The grassy knoll theory is a conspiracy theory that suggests there was a second shooter involved in the assassination of President John F. Kennedy on November 22, 1963 in Dallas, Texas. It proposes that a shooter positioned on the grassy knoll area of Dealey Plaza fired a fatal shot from a different angle, contradicting the official conclusion that the assassination was carried out solely by Lee Harvey Oswald from the Texas School Book Depository. This theory is supported by claims of eyewitnesses who reported hearing shots and seeing suspicious activity in the grassy knoll area during the time of the assassination. However, extensive investigations and expert analysis have generally discredited this theory, supporting the lone gunman theory as the most plausible explanation for Kennedy's assassination.