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On "Kelly File" tonight, biographer Paul Kengor shared a remarkable untold story that revealed Nancy Reagan's incredible devotion to her husband.

Kengor said he was contacted by the Reagans former pastor with whom Mrs. Reagan had discussed the assassination attempt on President Reagan's life.

"He was getting near to the end of his life, and he wanted to get this information to me," he said of the pastor.

Kengor said that when Ronald Reagan was shot March 30, 1981, Nancy called the Rev. Evans and apparently was in need of some spiritual counseling.

"Nancy was sitting there and she said you know, I'm struggling with this feeling of failed responsibility... because I always stand next to Ronnie on his left side, and he was shot on his left side. And if I had only been there when he was walking to that car on his left side I could have taken that bullet for Ronnie."

Watch the clip above, and read Kengor's special piece on here.

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