On 22 November 1963, Mr Hill - part of first lady Jacqueline Kennedy's security detail on the day of the assassination - leapt from a Secret Service car to the US president's after Mr Kennedy was shot.
His wife Lisa McCubbin Hill, a journalist who met Mr Hill while writing 2012's The Kennedy Detail: JFK's Secret Service Agents Break Their Silence, said on Instagram: "From the moment we met, there was an undeniable spark between us.
While Mr Hill was commended for his actions and became the agent in charge of the White House protective detail, he blamed himself for Mr Kennedy's death and retired from the Secret Service in 1975 - aged 43.
Clint Hill, the Secret Service agent who leapt onto John F Kennedy's limousine after he was shot, has died aged 93.
After his retirement, Mr Hill co-authored several books about his time in the Secret Service with Mrs McCubbin Hill.
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