A long-lost 8mm film shot by Dallas repairman Orville Nix on November 22, 1963, may reveal a second shooter in the assassination of President John F. Kennedy. The footage, which shows a shadowy figure behind the fence on the infamous grassy knoll, has been missing since 1978 and is now at the center of a $900 million lawsuit against the U.S. government.

Nix's granddaughter Linda Gayle Nix Jackson filed court papers seeking to recover the original film, claiming it could prove Lee Harvey Oswald did not act alone. The footage, taken from across Dealey Plaza, captures the grassy knoll area at the moment of the shooting and includes a clear view of Jackie Kennedy in the presidential limousine. Modern enhancement technology could reveal details impossible to detect during the 1978 congressional investigation.

A federal judge has allowed the lawsuit to proceed, despite government claims that it no longer possesses the film. Over six decades, the footage has reportedly passed through the hands of the FBI, United Press International, Congress, and a Los Angeles aerospace firm. The historical value could be incalculable, potentially bolstering the 1978 House Select Committee's conclusion that JFK's assassination was "probably" the result of a conspiracy.