Four sitting presidents have been killed: Abraham Lincoln (1865, by John Wilkes Booth), James A. Garfield (1881, by Charles J. Guiteau), William McKinley (1901, by Leon Czolgosz), and John F. Kennedy (1963, by Lee Harvey Oswald).
Answer:
4
Step-by-step explanation:
Abraham Lincoln, James Garfield, William McKinley, and John Kennedy
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