The sad event occurred on June 30, 1974, about six years after her son was killed. It was a Sunday, and Mrs King and her family were at their Ebenezer Baptist Church in Atlanta, Ga., which was headed by her husband, Rev. Martin Luther King Sr. King Sr. was not at church that day. Mrs. King was reportedly elated that she would be playing a new organ the church had just received. In front of about 500 congregants, the 69-year-old began playing the organ for the Lord’s Prayer while the congregation bowed their heads in prayer. That was when the...