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Friday will mark the 50th anniversary of President John F. Kennedy’s assassination and there are still unanswered questions about what happened on that day.

The president’s niece, former Maryland Lt. Governor Kathleen Kennedy Townsend, appeared on Fox News Sunday and questioned whether her uncle’s killer acted alone.

“Do you believe that Lee Harvey Oswald was the lone assassin?”

“I don’t know. I don’t know. I think ... I don’t know. ... I'm not going to solve that problem. And so what I'm going to do is focus on things that I can do.”

Former U.S. Marine Lee Harvey Oswald was arrested in Dallas — accused of shooting President Kennedy and Texas Gov. John Connally.

Oswald was shot and killed two days later by Jack Ruby while being transported to county jail.

In 1964, the Warren Commission concluded Oswald had acted alone in the shooting. But Townsend is not alone in questioning the official line.

Last week, in an interview on NBC’s “Meet the Press,” Secretary of State John Kerry said he had “serious doubts” Oswald had acted alone. He has since refused to elaborate.

A recent Gallup poll also found that 61 percent of Americans believed multiple people were involved in President Kennedy’s death. Still, that number is at its lowest since 1966, three years after the assassination.

- See more at Newsy.com