Clint Hill was a 31-year-old Secret Service agent on that fateful day in Dallas in November 1963 when Lee Harvey Oswald altered the course of American history.

He’s the guy in the famous Zapruder film, flinging his body over first lady Jacqueline Kennedy. Now 85, Hill recalled in an interview with LifeZette that he had no time to think before swinging into action.

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“It was an instant reaction to the events that were happening,” said Hill, who was riding in the vehicle behind the presidential car. “My only thought was to get there as quickly as possible, form that shield, give the driver a chance to evacuate the area. It’s what we call ‘cover and evacuate.'”

Hill said that by the time he reached the Kennedy’s car on Nov. 22, 1963, the president had already been shot. He said he immediately saw the severity of the head wound and noted that the president’s eyes were fixed.

“I assumed at that moment that he was dead,” he said. “And I turned to give a thumbs-down to the follow-up car crew to let them know, and then I screamed at the driver to get us to the hospital.”

The problem, Hill said, is that the Secret Service agents were from out of town. He said the Dallas police chief fortunately moved quickly to escort the car to Parkland Memorial Hospital.

“We actually didn’t know how to get to any hospital,” he said. “None of us were familiar with the area.”

Hill spoke to LifeZette ahead of his appearance Saturday at a conference organized by the American Veterans Center. “American Valor: A Salute to Our Heroes” will air on Veterans Day and feature an all-star lineup of entertainers.

The LifeZette interview also took place amid the federal government’s release of thousands of documents related to the assassination. Hill said he has not had a chance to look at the new documents but doubts it will change his conclusion that the Warren Commission was right.

“Every bit of information I’ve ever found leads me to the same conclusion that Lee Harvey Oswald acted alone.”

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“Every bit of information I’ve ever found leads me to the same conclusion that Lee Harvey Oswald acted alone,” he said.

On that, Hill is firmly in the minority. Gallup consistently over the years has found that a majority of Americans believe others were involved. It was 61 percent the last time the company asked the question, in 2013.

Hill blames the 1991 film “JFK,” directed by conspiracy theorist Oliver Stone. The movie was “filled with so many falsehoods,” he said.

But doubts long predate the movie. In fact, the highest share ever recorded by Gallup occurred in 1976, when 81 percent thought others were involved with Kennedy’s assassination compared with 11 percent who believed one man killed him.

The newly released documents from the archive indicate that the doubts, in fact, started in the immediate aftermath of the shooting. A 1966 memo prepared by then-FBI Director J. Edgar Hoover relayed confidential sources inside the Soviet Union indicating that officials in the Communist government believed the “ultra-right” killed the president and that Soviet officials feared their country would be blamed for it.

An unnamed informant later told American spies that the KGB believed then-Vice President Lyndon Johnson was responsible.

The House Select Committee on Assassinations concluded in 1979 that Oswald likely did not act alone, but it did not name suspects.

Even Johnson dabbled in conspiracy theories. A document from 1975 indicated that CIA Director Richard Helms said President Johnson had often said he thought that the assassination might have been payback for the assassination of South Vietnam’s president, Ngo Dinh Diem.

But Hill said Oswald was an unbalanced figure who had failed at nearly everything he had attempted.

“Most people wouldn’t trust Lee Harvey Oswald to do anything … He was basically a loser in everything that he tried,” he said. “He, I think, kept on looking for something to bring attention to himself.”

Hill described the awful aftermath of the shooting from the perspective of someone who stayed by Jackie Kennedy’s side. He said he viewed the body at about 2 a.m. at the hospital and recalled speaking by phone with the president’s brother, Attorney General Bobby Kennedy.

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At one point, he said, Jackie Kennedy wanted to see the body and asked for a pair of scissors to cut some of his hair. Later, Hill said, he helped the new widow pick out a gravesite and attended the funeral with her. He said he also helped put on a small birthday party for John F. Kennedy Jr., who turned three just three days after his father’s death.

Although Hill doubts the new documents will change his mind, he said he is eager to review them.

“I’m seeking a motive, or an answer to the question, why?” he said. “‘Cause we never had the opportunity to interrogate Oswald … So we never got to that point where we could ascertain what his motive was, why he did what he did. And that’s always been important to me and to all of us.”