Here are key dates in the life of US civil rights leader Martin Luther King Jr., the pastor, Nobel Peace Prize winner and preacher of non-violence who was assassinated 50 years ago on April 4, 1968. – January 15, 1929: King is born in Atlanta in the southern state of Georgia. – June 18, 1953: He marries Coretta Scott and they go on to have four children. – December 1955: A pastor at the Baptist Church in Montgomery, Alabama, King takes the lead of…