April 3, 1996 Unabomber Ted Kaczynski is arrested after 17 years of terror.
April 4, 1968 Martin Luther King Jr. is shot and killed in Memphis, Tenn.
April 5, 1951 Julius and Ethel Rosenberg are sentenced to death for conspiring to give U.S. atomic bomb secrets to the Soviet Union.
April 6, 1896 The first modern Olympic Games open in Athens, Greece.
April 7, 1994 In Rwanda, Hutu militias begin killing Tutsis, sparking a nearly four-month-long genocide.