Mom, who shot Abraham Lincoln? What was the name of the other President that was killed? And why?
Wikipedia is soooooo much better at this kinda thing than I am:
Abraham was shot by John Wilkes Booth
Unfortunately, 3 other U.S. Presidents were assassinated:
James Garfield
William McKinley
John F. Kennedy
There were also attempted assassinations on 12 additional Presidents, the latest of which was sitting President, George W. Bush. He has had 2 attempted assassinations. The first was outside the White House in 2001 and the 2nd was during a speech in Tbilisi, Georgia. Both men were convicted.
(oh, and that was for your reading pleasure. My kiddos got the very simple-- and vague-- answer. As well as a few questions of my own like, Where did you hear this? and Why is it coming up?)