Three assassinated Presidents all had the same close assistant/advisor/friend who was extremely loyal to all three and mourned each death as if it were his own brother who died.
Who were the President's and who was the person?
Lincoln, Garfield, McKinley.John Hay.
Also:Lincoln invited his son, Robert Todd Lincoln, to attend the play the night he was assasinated, but Robert declined. Robert Lincoln also served as Secretary of War under Garfield, and was present at the DC train station, at Garfield's invitation, when Garfield was assasinated by Charles Guiteau. Robert Lincoln was also invited to, and in attendence at, the Pan American Exhibition in 1901 by President McKinley when McKinley was shot by Leon Czolgosz. After that, he refused to attend any event where a President was there also, since he was invited to the assasinations of three presidents.
The really, really weird part? In 1863 or '64, prior to his father's assasination, Robert Todd Lincoln was travelling by train from New York to Washington DC. He was waiting to change trains in Jersey City and was walking too close to the edge of the platform craning his neck to see when the train would arrive--not realizing the incoming train was coming from the other direction. He was pulled away at the last second and his life was saved by...