Exclusive: Inside Jackie Kennedy's Heartbreaking Final Moments With JFK

A Secret Service agent assigned to Jackie Kennedy has revealed her final heartbreaking moments with her husband John F. Kennedy, in footage shared exclusively with Newsweek.

Clint Hill, now 91, was with the motorcade when JFK was assassinated in Dallas, Texas, in 1963. He later traveled with Jackie Kennedy in the back of the hearse containing the body of the 35th president of the United States.

John F. Kennedy had entered office in 1961 when he was 43 years old, becoming the youngest elected leader in American history.

By the time he decided to travel to Texas to smooth over frictions in the state's Democratic Party in November 1963, he had been in office for almost three years.

During his visit, a motorcade was organized for November 22. The motorcade's route through Dallas was designed to give Kennedy maximum exposure to crowds, with Kennedy also seeing the trip as an informal launch of his 1964 reelection bid.

He was in the car with Jackie Kennedy, Texas Governor John Connally, and Connally's wife, Nellie, when he was fatally shot by former U.S. Marine Lee Harvey Oswald. Thirty minutes after the shooting, Kennedy was pronounced dead.

During the assassination, the then 31-year-old Hill ran from the Secret Service follow-up car and jumped onto the back of the limousine. He shielded Jackie Kennedy and the stricken president with his body while they raced to the hospital.

Once they arrived the president's brother, Attorney General Robert F. Kennedy, called Hill, who declined to tell Robert Kennedy over the phone that his brother was dead, thinking it inappropriate.

Now National Geographic's upcoming docuseries JFK: One Day in America explores the events of November 22, including the shocking moments following the president's death. The story is being told through the use of archival photos and footage, some newly colorized for the first time, and interviews with some of the figures who lived through it.

The docuseries premieres November 5, commemorating the 60th anniversary of Kennedy's assassination. In Newsweek's exclusive video, Hill, the Secret Service agent assigned to Jackie Kennedy, talks about the ride from the hospital to Air Force One, where she refused to leave her husband's side.

In one scene from the docuseries, Hill discusses the moments after Kennedy's death.

"The nurses wrapped him in white sheets and put him in the casket," he said.

"We took him out, they put him in the back of the hearse and I turned to Mrs Kennedy and I said, 'Oh, Mrs Kennedy we can ride in this car right back here,' and she said 'No, no, no, Mr Hill, I'm going to ride in there with with with Jack.' And so she crawls into the back of the hearse so I crawl in there with her.

"So there we were in the back of that hearse, Mrs Kennedy and me; it was a little bit crowded."

He added: "We went and drove to Lovefield where Air Force One was situated and then we had to offload the casket."

Hill remained assigned to Kennedy and her children until after the 1964 presidential election, retiring in 1975.

Jackie wed her lifelong friend Aristotle Onassis, a Greek shipping tycoon, on October 20, 1968.

She took the legal name Jacqueline Onassis, and as a result, she was no longer eligible for Secret Service protection. The marriage brought her considerable adverse publicity and she became the target of paparazzi, who nicknamed her Jackie O.

Aristotle Onassis was 69 years old when he died from respiratory failure on March 15, 1975. His wife died in her sleep on May 19, 1994, from non-Hodgkin's lymphoma in New York. She was buried next to her first husband, President Kennedy, at Arlington National Cemetery.

Made in official collaboration with The Sixth Floor Museum at Dealey Plaza in Dallas, JFK: One Day in America serves as oral history with key testimony from some of the last surviving witnesses weaved in with archival footage from the museum. The series premieres on National Geographic on November 5, with episodes available to stream the following day on Disney+ and Hulu.