Answer :
Answer:
4
Explanation:
Abraham Lincoln, James Garfield, William McKinley, and John Kennedy
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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).