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More than six decades after the killing of President John F. Kennedy, never-before-seen footage of the assassination’s immediate aftermath has come to light.

The minute-long, 8mm colour film is now being auctioned off by online bidding site RR Auction and the live auction is scheduled for September 28.

The two segments of the recovered tape show the president’s motorcade travelling through downtown Dallas and then accelerating in the direction of Parkland Hospital while both the president and Jackie Kennedy are protected by Secret Service member Clint Hill.

The former Secret Service Agent. now 92, says that seeing the video after all this time was “an emotional thing”.

“The discovery of the film is an emotional thing for me because I know what has happened. I know what I’m seeing in that film is a dead president.”

Dale Carpenter Sr., a truck driver from Dallas who lives nearby, took the video from Stemmons Freeway. James Gates, the grandson of Carpenter, told PEOPLE that his mother gave him family heirlooms shortly after his grandpa passed away from Parkinson’s illness, which is how the movie ended up in his possession.

“She gave me several reels of family films and audio recordings, a projector and the reel-to-reel audio recorder. The film was stored in a plastic Dean Foods milk crate and had been in my closet for several years before I decided to put it in a fire safe.”

RR Auction executive vice president, Bobby Livingston, says the unique footage is a part of American history.

“Unlike any other footage known to exist, this film captures a segment immediately following the Zapruder film, providing a fresh perspective on one of the most analyzed moments in history.”

“Once you see it, you’ll never forget Clint Hill’s heroic efforts to protect Mrs. Kennedy, racing at 80 miles an hour in a desperate attempt to save the president’s life as they sped to Parkland.”