Presidents and First Ladies Trivia

[RJNorton]

No googling, please.

On the last day of his life this former President spent time in the morning working on a jigsaw puzzle of George Washington.

Not feeling well he went up to his room to lay down very early in the afternoon.

Shortly thereafter, his wife found him dead on the bathroom floor adjacent to his bedroom. His cause of death was a heart attack.

Who was he?