A long-lost piece of film could blow the JFK assassination wide open — and prove once and for all there was a second shooter on the grassy knoll that fateful day.

Of the four American presidents who've been assassinated, John F. Kennedy's death is the one that haunts people the most.

Sid Davis, who died on Oct. 13, was the last surviving reporter who watched Lyndon Johnson sworn in to the presidency aboard Air Force One.