Question: What was the name of Reverend Martin Luther King Sr's wife that was shot and killed in the Evenezer Baptist Church, six years after the assassination of her son, Martin Luther King Jr.?

full_context: Document 1: Septima Poinsette Clark: Septima Poinsette Clark (May 3, 1898 – December 15, 1987) was an American educator and civil rights activist. Clark developed the literacy and citizenship workshops that played an important role in the drive for voting rights and civil rights for African Americans in the Civil Rights Movement. Septima Clark's work was commonly under appreciated by Southern male activists. She became known as the "Queen mother" or "Grandmother" of the Civil Rights Movement in the United States. Martin Luther King, Jr. commonly referred to Clark as "The Mother of the Movement". Clark's argument for her position in the Civil Rights Movement was one that claimed "knowledge could empower marginalized groups in ways that formal legal equality couldn't."
Document 2: Alveda King: Alveda Celeste King (born January 22, 1951) is an American activist, author and former state representative for the 28th District in the Georgia House of Representatives.
Document 3: Martin Luther King Jr.: Martin Luther King Jr. (born Michael King Jr., January 15, 1929 – April 4, 1968) was an American Baptist minister and activist who became the most visible spokesperson and leader in the Civil Rights Movement. He is best known for his role in the advancement of civil rights using the tactics of nonviolence and civil disobedience based on his Christian beliefs and inspired by the nonviolent activism of Mahatma Gandhi.
Document 4: Alpha Man: The Brotherhood of MLK: Alpha Man: The Brotherhood of MLK is a television documentary film that reveals the story of Martin Luther King Jr.’s fraternity days as a member of Alpha Phi Alpha fraternity. Produced by Rainforest Films, the half-hour special originally aired August 28, 2011 on Black Entertainment Television (BET). The documentary special was scheduled to debut on the same day as the much-anticipated official dedication of the Martin Luther King, Jr. Memorial statue on the National Mall in Washington, D.C.. The statue's dedication, which was to coincide with the 48th anniversary of the March on Washington and King’s "Dream" speech, was postponed until October 16, 2011 due to Hurricane Irene.
Document 5: Alberta Williams King: Alberta Christine Williams King (September 13, 1904 – June 30, 1974) was Martin Luther King, Jr.'s mother and the wife of Martin Luther King, Sr. She played a significant role in the affairs of the Ebenezer Baptist Church. She was shot and killed in the church six years after the assassination of Martin Luther King, Jr.
Document 6: Martin Luther King Jr. National Historic Site: The Martin Luther King Jr. National Historic Site consists of several buildings including Martin Luther King Jr.'s boyhood home and the original Ebenezer Baptist Church, the church where King was baptized and both his father Martin Luther King Sr. and he were pastors. These places, critical to the interpretation of the life of Martin Luther King Jr. and his legacy as a leader of the American Civil Rights Movement, were included in the National Historic Site when it was established on October 10, 1980.
Document 7: Queen Mother Moore: Queen Mother Moore (July 27, 1898 – May 2, 1997) was an African-American civil rights leader and a black nationalist who was friends with such civil rights leaders as Marcus Garvey, Nelson Mandela, Rosa Parks, and Jesse Jackson. She was a figure in the American Civil Rights Movement and a founder of the Republic of New Afrika.
Document 8: King Kennedy: King Kennedy is an upcoming drama thriller film set in the 1960s made entirely from archive material. The film stars some of the most prominent characters from 1960s America, including US President John F. Kennedy, Robert F. Kennedy, the civil rights movement leader Martin Luther King, convicted assassins Lee Harvey Oswald and Sirhan Sirhan and the film world's brightest icons of that time Marilyn Monroe and Frank Sinatra. The plot line revolves around the concepts of truth and freedom, but pursues further towards deception, intrigue, conspiracy and murder, and features some of the most memorable moments in 1960s America, including Marilyn Monroe's world-famous "Happy Birthday, Mr. President" at Madison Square Garden and Martin Luther King's "I Have A Dream" speech on the steps of the Lincoln Memorial in which he called for racial equality and an end to discrimination. The film is designed primarily to remind, focusing on the characters and events that build up to the assassinations of John F. Kennedy, Robert F. Kennedy and Martin Luther King as their apparent determination to shy away from war, discrimination and hatred became ever more publicized.
Document 9: King Center for Nonviolent Social Change: The Martin Luther King Jr. Center for Nonviolent Social Change is a nongovernmental, not-for-profit organization founded in 1968 by Coretta Scott King. King started the organization in the basement of the couple's home in the year following the 1968 assassination of her husband, Martin Luther King Jr.
Document 10: Clayborne Carson: Clayborne Carson (born June 15, 1944) is an African-American professor of history at Stanford University, and director of the Martin Luther King, Jr., Research and Education Institute. Since 1985 he has directed the Martin Luther King Papers Project, a long-term project to edit and publish the papers of Martin Luther King, Jr.
Document 11: In the Hour of Chaos: In the Hour of Chaos is a 2016 American documentary film directed by Bayer Mack. It details the life and various trials of the Reverend Martin Luther King Sr. ("Daddy King"), including his violent, poverty-stricken upbringing in rural Georgia, the assassination of his oldest son (civil rights leader Martin Luther King Jr.), the drowning of his younger son Alfred Daniel Williams King and the shooting death of his wife, Alberta Williams King.
Document 12: Alberta Williams King: Alberta Christine Williams King (September 13, 1904 – June 30, 1974) was Martin Luther King, Jr.'s mother and the wife of Martin Luther King, Sr. She played a significant role in the affairs of the Ebenezer Baptist Church. She was shot and killed in the church six years after the assassination of Martin Luther King, Jr.
Document 13: Martin Luther King Jr.: Martin Luther King Jr. (born Michael King Jr., January 15, 1929 – April 4, 1968) was an American Baptist minister and activist who became the most visible spokesperson and leader in the Civil Rights Movement. He is best known for his role in the advancement of civil rights using the tactics of nonviolence and civil disobedience based on his Christian beliefs and inspired by the nonviolent activism of Mahatma Gandhi.
Document 14: Myrlie Evers-Williams: Myrlie Louise Evers–Williams (née Beasley; born March 17, 1933) is an American civil rights activist of the Civil Rights Movement and journalist who worked for over three decades to seek justice for the murder of her civil rights activist husband Medgar Evers in 1963. She was also chairwoman of the NAACP, and published several books on topics related to civil rights and her husband’s legacy. On January 21, 2013, she delivered the invocation at the second inauguration of Barack Obama.
Document 15: King (miniseries): King is a 1978 American television miniseries based on the life of Martin Luther King Jr., the American civil rights leader and 1964 Nobel laureate. It aired for three consecutive nights on NBC from February 12 through 14, 1978. The miniseries earned nine Emmy Award nominations, including nominations for actors Paul Winfield, Cicely Tyson and Ossie Davis. Several real-life figures from the Civil Rights Movement had minor roles in the production, including then-Atlanta mayor Maynard Jackson, King's sister Christine King Farris, his niece Alveda King, and his four children: Yolanda, Martin III, Dexter and Bernice. Donzaleigh Abernathy, Tony Bennett, Julian Bond and Ramsey Clark each portrayed themselves.
ground_truth: Alberta Williams King