A grainy 8mm film allegedly hidden away by federal authorities for decades could blow the lid off the assassination of President John F. Kennedy — and prove there was a second shooter on the infamous grassy knoll, the National Examiner can reveal.

Dallas air-conditioning repairman Orville Nix shot the remarkable footage on that fateful day, Nov. 22, 1963, in Dealey Plaza. The film captures a startling image of a shadowy figure lurking behind a fence on the knoll — the very spot where many witnesses reported hearing gunfire, per New York Post.

While the famous Zapruder film shows the instant JFK was struck in the head, Nix was positioned across the street, aiming his camera directly toward the grassy knoll. His footage includes a clear view of First Lady Jackie Kennedy climbing onto the back of the presidential limousine — with the fence in the background.

The original, first-generation film has not been seen since 1978, when it was sent to a Los Angeles company for analysis and was allegedly seized by federal authorities, who now claim they no longer possess it.

Nix died in 1972, but his granddaughter Linda Gayle Nix Jackson has filed court papers against the U.S. government seeking to recover the missing film. She claims it could be worth as much as $900 million because it may prove once and for all that Lee Harvey Oswald did not act alone in assassinating JFK. A judge has ruled her lawsuit may proceed. The government insists it doesn’t possess the original film.

Over the past six decades, Nix’s footage has reportedly passed through the hands of the FBI, United Press International, Congress and the Aerospace Corporation — the Los Angeles firm that says it returned the film to the National Archives after completing its analysis.

The historical value of the footage could be incalculable. It may bolster the findings of a 1978 House Select Committee on Assassinations report, which concluded that JFK was “probably assassinated as a result of a conspiracy.”

“Nix’s film is really the only one known to have captured the grassy knoll area of Dealey Plaza at the moment the assassination occurred,” says Scott Watnik, an attorney for Jackson.

Modern technology could dramatically enhance the footage’s clarity, adds Watnik: “We could certainly reveal details that were impossible to detect when the committee examined the film in 1978.”

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